{"product_id":"gc-tek-nishikigoi-rdf-drum-filter","title":"GC Tek NishikigoiRDF Rotating Drum Filter","description":"\u003cstyle\u003e\n.gct{--ink:#e7ecf1;--mut:#9fb0bf;--bg:#111417;--bg2:#1a1f24;--line:#2b333b;--aq:#22c1dc;--or:#ff7a1a;--ok:#3ddc97;font-family:Inter,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--ink);background:var(--bg);border-radius:18px;padding:28px 26px;line-height:1.55}\n.gct *{box-sizing:border-box}.gct\u003e*{margin-top:0!important}.gct h2,.gct h3{font-family:'Barlow Condensed','Saira Condensed',Inter,sans-serif!important;text-transform:none!important;letter-spacing:.01em;color:#fff!important;line-height:1.1;margin:0}\n.gct h2{font-size:32px;font-weight:700}.gct h3{font-size:20px;font-weight:700}.gct p{margin:0 0 12px;color:var(--ink)}.gct .eyebrow{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--aq);font-weight:700;margin:0 0 8px}\n.gct .lede{font-size:17px;color:var(--mut);max-width:70ch}.gct .bto{display:flex;gap:14px;align-items:flex-start;background:#2a1b0e;border:1px solid #6b3a12;border-left:5px solid var(--or);border-radius:12px;padding:14px 16px;margin:0 0 22px}\n.gct .bto b{color:#ffb070;display:block;font-size:14px;letter-spacing:.06em;text-transform:uppercase;margin-bottom:3px}.gct .bto p{margin:0;color:#f3e5d8;font-size:14px}.gct .bto svg{flex:0 0 26px;margin-top:2px}\n.gct .trust{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:18px 0 26px}.gct .trust div{background:var(--bg2);border:1px solid var(--line);border-radius:10px;padding:12px 14px;font-size:13px;color:var(--mut)}.gct .trust div b{display:block;color:#fff;font-size:14px;margin-bottom:2px}\n.gct .feat{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:0 0 26px;align-items:stretch;grid-auto-rows:1fr}.gct .feat\u003e*{margin-top:0!important}.gct .feat div{background:var(--bg2);border:1px solid var(--line);border-top:3px solid var(--aq);border-radius:12px;padding:16px}.gct .feat h3{font-size:18px;margin:0 0 6px}.gct .feat p{font-size:14px;color:var(--mut);margin:0}\n.gct .sec{margin:0 0 12px;padding-top:6px}.gct .tbl{overflow-x:auto;margin:0 0 26px;border:1px solid var(--line);border-radius:12px}.gct table{width:100%;border-collapse:collapse;font-size:14px;min-width:560px}.gct th{background:#0c1e24;color:var(--aq);text-align:left;padding:10px 12px;font-weight:700;font-size:12px;letter-spacing:.08em;text-transform:uppercase;border-bottom:1px solid var(--line)}\n.gct td{padding:10px 12px;border-bottom:1px solid var(--line);color:var(--ink)}.gct tr:last-child td{border-bottom:0}.gct td:first-child{font-weight:700;color:#fff;white-space:nowrap}\n.gct .note{background:var(--bg2);border:1px solid var(--line);border-left:4px solid var(--aq);border-radius:10px;padding:14px 16px;margin:0 0 26px;font-size:14px;color:var(--mut)}.gct .note b{color:#fff}.gct .note.warn{border-left-color:var(--or)}\n.gct .two{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:0 0 26px}.gct .two\u003e*{margin-top:0!important}.gct .box{background:var(--bg2);border:1px solid var(--line);border-radius:12px;padding:16px}.gct .box h3{margin:0 0 8px}.gct ul{margin:0;padding-left:18px;color:var(--mut);font-size:14px}.gct li{margin:0 0 6px}.gct li b{color:#fff}\n.gct .faq details{border-bottom:1px solid var(--line);padding:10px 0}.gct .faq summary{cursor:pointer;color:#fff;font-weight:600;font-size:15px}.gct .faq p{font-size:14px;color:var(--mut);margin:8px 0 0}\n.gct .links a{display:inline-block;background:#0c1e24;border:1px solid #1f4a55;color:var(--aq);text-decoration:none;border-radius:999px;padding:7px 14px;font-size:13px;margin:0 8px 8px 0;font-weight:600}.gct .links a:hover{background:#123540}\n.gct .brand{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;border-top:1px solid var(--line);padding-top:18px;margin-top:6px}.gct .brand p{margin:0;font-size:13px;color:var(--mut)}.gct .brand b{color:#fff}.gct .brand .tag{color:var(--aq);font-family:'Barlow Condensed','Saira Condensed',sans-serif;font-size:22px;font-weight:700}\n@media(max-width:860px){.gct .feat{grid-template-columns:repeat(2,1fr)}.gct .trust{grid-template-columns:1fr}.gct .two{grid-template-columns:1fr}.gct h2{font-size:26px}.gct{padding:20px 16px}}\n\u003c\/style\u003e\u003cdiv class=\"gct\"\u003e\n\u003cdiv class=\"bto\"\u003e\n\u003csvg width=\"26\" height=\"26\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#ffb070\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003cpath d=\"M3 7h11v9H3zM14 10h4l3 3v3h-7z\"\u003e\u003c\/path\u003e\u003ccircle cx=\"7\" cy=\"18\" r=\"2\"\u003e\u003c\/circle\u003e\u003ccircle cx=\"17\" cy=\"18\" r=\"2\"\u003e\u003c\/circle\u003e\u003c\/svg\u003e\u003cdiv\u003e\n\u003cb\u003eBuilt to order · ships in about 3 weeks · freight delivery\u003c\/b\u003e\u003cp\u003eGC Tek assembles this unit at the factory after you order — allow roughly 3 weeks before it ships. It travels by LTL freight; \u003cstrong\u003eno freight is charged at checkout\u003c\/strong\u003e. We quote the freight to your address and confirm it with you before anything ships. Local pickup in Upland, CA is always free.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"eyebrow\"\u003eGC Tek NishikigoiRDF · rotating drum filter · polypropylene or 316 stainless · 2,500 to 100,000 gal\u003c\/p\u003e\n\u003ch2\u003eMechanical filtration that cleans itself — for every size pond imaginable\u003c\/h2\u003e\n\u003cp class=\"lede\"\u003eA rotating drum filter pulls solids out of the water on a 75-micron 316 stainless mesh before they ever reach your biological filter, then rinses the screen automatically the moment the water level drops — no baskets, no backwash, no bead bed to clog. GC Tek's NishikigoiRDF comes in ten sizes and two bodies: heavy-duty polypropylene, or full 316 stainless. Multiple inlets and outlets in oversized pipe, a 40 W drum motor and 120 W wash pump, and the price-to-flow ratio you expect from GC Tek.\u003c\/p\u003e\n\u003cdiv class=\"trust\"\u003e\n\u003cdiv\u003e\n\u003cb\u003eAuthorized GC Tek dealer\u003c\/b\u003eGenuine product, factory warranty, distributor-direct.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eWarranty \u0026amp; support handled here\u003c\/b\u003eWe set up, troubleshoot and handle warranty claims in-house.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eFreight confirmed before it ships\u003c\/b\u003eYou approve the freight quote first — no surprises at the door.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"note\"\u003e\n\u003cb\u003eNew for 2026.\u003c\/b\u003e GC Tek's Nishikigoi line — designed in Chandler, Oklahoma, built to the standard koi keepers expect from the AlphaONE. First shipments started June 2026; better model-by-model photos are on the way from GC Tek.\u003c\/div\u003e\n\u003cdiv class=\"feat\"\u003e\n\u003cdiv\u003e\n\u003ch3\u003e75-micron 316 SS screen\u003c\/h3\u003e\n\u003cp\u003eFine enough to strip feed fines and string algae, tough enough for decades.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch3\u003eAutomatic backwash\u003c\/h3\u003e\n\u003cp\u003eFloat switch senses the drop across the screen, the drum rotates and the spray bar rinses it to waste. About 3–4 gallons per cycle.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch3\u003eGravity or pumped\u003c\/h3\u003e\n\u003cp\u003ePlumb it gravity-fed off bottom drains ahead of the pump, or pump-fed. The 30 handles 6,000–8,000 gph gravity \/ 7,950 gph pumped.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch3\u003ePairs with AlphaONE\u003c\/h3\u003e\n\u003cp\u003eDrum for solids, AlphaONE \/ AlphaNANO or a Wakimizu shower for biology. This is how GC Tek builds the big ponds now.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3 class=\"sec\"\u003eSizes\u003c\/h3\u003e\n\u003cdiv class=\"tbl\"\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eMax flow\u003c\/th\u003e\n\u003cth\u003ePond up to\u003c\/th\u003e\n\u003cth\u003eIn \/ out\u003c\/th\u003e\n\u003cth\u003eFootprint (L × H × W)\u003c\/th\u003e\n\u003cth\u003ePolypropylene\u003c\/th\u003e\n\u003cth\u003e316 Stainless\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eRDF 5\u003c\/td\u003e\n\u003ctd\u003e1,350 gph\u003c\/td\u003e\n\u003ctd\u003e2,500 gal\u003c\/td\u003e\n\u003ctd\u003e2 × 1.5\"\u003c\/td\u003e\n\u003ctd\u003e20.5\" L × 20\" H × 17\" W\u003c\/td\u003e\n\u003ctd\u003e$995.00\u003c\/td\u003e\n\u003ctd\u003e$2,680.00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRDF 10\u003c\/td\u003e\n\u003ctd\u003e2,650 gph\u003c\/td\u003e\n\u003ctd\u003e5,500 gal\u003c\/td\u003e\n\u003ctd\u003e2 × 2\"\u003c\/td\u003e\n\u003ctd\u003e22\" L × 20\" H × 17\" W\u003c\/td\u003e\n\u003ctd\u003e$1,349.95\u003c\/td\u003e\n\u003ctd\u003e$2,974.95\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRDF 20\u003c\/td\u003e\n\u003ctd\u003e5,300 gph\u003c\/td\u003e\n\u003ctd\u003e10,500 gal\u003c\/td\u003e\n\u003ctd\u003e2 × 2.5\"\u003c\/td\u003e\n\u003ctd\u003e27.5\" L × 24\" H × 21.5\" W\u003c\/td\u003e\n\u003ctd\u003e$2,269.95\u003c\/td\u003e\n\u003ctd\u003e$3,119.95\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRDF 30\u003c\/td\u003e\n\u003ctd\u003e7,950 gph\u003c\/td\u003e\n\u003ctd\u003e16,000 gal\u003c\/td\u003e\n\u003ctd\u003e2 × 4\"\u003c\/td\u003e\n\u003ctd\u003e31\" L × 28\" H × 25\" W\u003c\/td\u003e\n\u003ctd\u003e$2,995.00\u003c\/td\u003e\n\u003ctd\u003e$5,295.00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRDF 60\u003c\/td\u003e\n\u003ctd\u003e16,000 gph\u003c\/td\u003e\n\u003ctd\u003e32,000 gal\u003c\/td\u003e\n\u003ctd\u003e3 × 4\"\u003c\/td\u003e\n\u003ctd\u003e47\" L × 38\" H × 31\" W\u003c\/td\u003e\n\u003ctd\u003e$4,575.00\u003c\/td\u003e\n\u003ctd\u003e$7,495.00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRDF 80\u003c\/td\u003e\n\u003ctd\u003e21,200 gph\u003c\/td\u003e\n\u003ctd\u003e42,000 gal\u003c\/td\u003e\n\u003ctd\u003e4 × 4\"\u003c\/td\u003e\n\u003ctd\u003e50\" L × 41\" H × 24\" W\u003c\/td\u003e\n\u003ctd\u003e$5,899.00\u003c\/td\u003e\n\u003ctd\u003e$9,795.00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRDF 100\u003c\/td\u003e\n\u003ctd\u003e26,500 gph\u003c\/td\u003e\n\u003ctd\u003e55,000 gal\u003c\/td\u003e\n\u003ctd\u003especial order\u003c\/td\u003e\n\u003ctd\u003e54\" L × 45\" H × 40\" W\u003c\/td\u003e\n\u003ctd\u003e$7,739.95\u003c\/td\u003e\n\u003ctd\u003e$10,995.00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRDF 125\u003c\/td\u003e\n\u003ctd\u003e33,000 gph\u003c\/td\u003e\n\u003ctd\u003e65,000 gal\u003c\/td\u003e\n\u003ctd\u003especial order\u003c\/td\u003e\n\u003ctd\u003e55\" L × 42.5\" H × 42\" W\u003c\/td\u003e\n\u003ctd\u003e$8,199.95\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRDF 150\u003c\/td\u003e\n\u003ctd\u003e40,000 gph\u003c\/td\u003e\n\u003ctd\u003e80,000 gal\u003c\/td\u003e\n\u003ctd\u003especial order\u003c\/td\u003e\n\u003ctd\u003e63\" L × 51\" H × 46\" W\u003c\/td\u003e\n\u003ctd\u003e$10,419.95\u003c\/td\u003e\n\u003ctd\u003e$14,680.00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRDF 200\u003c\/td\u003e\n\u003ctd\u003e53,000 gph\u003c\/td\u003e\n\u003ctd\u003e100,000 gal\u003c\/td\u003e\n\u003ctd\u003especial order\u003c\/td\u003e\n\u003ctd\u003e70\" L × 57\" H × 52\" W\u003c\/td\u003e\n\u003ctd\u003e$12,369.95\u003c\/td\u003e\n\u003ctd\u003e$18,600.00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cdiv class=\"note warn\"\u003e\n\u003cb\u003eSizes 100 and up are special order\u003c\/b\u003e (RDF 125 in polypropylene only) — allow extra lead time and we'll confirm freight and offloading before it ships; these are large and heavy. All drums ship LTL freight with freight quoted before shipping.\u003c\/div\u003e\n\u003ch3 class=\"sec\"\u003eWhat comes with it\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDrum, 316 SS mesh, drum motor (40 W) and wash pump (120 W), spray bar, float switch and controller\u003c\/li\u003e\n\u003cli\u003eUnionized inlets\/outlets (2 × 1.5\" on the 5, up to 4 × 4\" on the 80) and a 2.5\" waste line\u003c\/li\u003e\n\u003cli\u003eReady for gravity-fed or pump-fed installation; we'll walk you through the plumbing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"links\"\u003e\n\u003ca href=\"\/products\/gc-tek-nishikigoi-wakimizu-bakki-shower\"\u003eWakimizu bakki shower (biological stage)\u003c\/a\u003e\u003ca href=\"\/products\/gc-tek-pressure-filters\"\u003eAlphaONE \/ AlphaNANO pressure filters\u003c\/a\u003e\u003ca href=\"\/products\/gc-tek-nishikigoiuv-horizontal\"\u003eNishikigoiUV\u003c\/a\u003e\u003ca href=\"\/pages\/gctek\"\u003eAll GC Tek\u003c\/a\u003e\n\u003c\/div\u003e\n\u003ch3 class=\"sec\"\u003eOrdering \u0026amp; delivery\u003c\/h3\u003e\n\u003cdiv class=\"faq\"\u003e\n\u003cdetails\u003e\u003csummary\u003eHow long until it ships?\u003c\/summary\u003e\u003cp\u003eMost GC Tek filters and systems are assembled to order in Chandler, Oklahoma. Typical lead time is about 3 weeks from order to ship, then transit time. Parts and media we stock ship from Upland, CA within a day or two.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhy no freight at checkout?\u003c\/summary\u003e\u003cp\u003eFreight for a pressure filter or pre-plumbed system depends on your address, liftgate needs and residential vs. commercial delivery. Charging a flat guess would overcharge some customers and undercharge others, so we quote it to the dollar and confirm with you before shipping.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eCan I pick it up instead?\u003c\/summary\u003e\u003cp\u003eYes — pick up free at Mystic Koi \u0026amp; Water Gardens in Upland, CA. Choose local pickup at checkout or tell us in the order notes and we'll skip freight entirely.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWho handles the warranty?\u003c\/summary\u003e\u003cp\u003eWe do. As an authorized GC Tek dealer we process warranty and parts through the factory for you — no shipping the tank back across the country.\u003c\/p\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"brand\"\u003e\n\u003cp\u003e\u003cspan class=\"tag\"\u003eGC Tek\u003c\/span\u003e\u003cbr\u003eGrand Champion Technologies · Chandler, Oklahoma · pond filtration built in the USA\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eMystic Koi \u0026amp; Water Gardens\u003c\/b\u003e — authorized GC Tek dealer, Upland, California.\u003cbr\u003eQuestions on sizing? Call the shop and talk to someone who runs these filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"GC Tek","offers":[{"title":"Polypropylene \/ RDF 5 — up to 2,500 gal","offer_id":47996437397653,"sku":"NGRDF5PP","price":995.0,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ RDF 5 — up to 2,500 gal","offer_id":47996437430421,"sku":"NGRDF5SS","price":2680.0,"currency_code":"USD","in_stock":true},{"title":"Polypropylene \/ RDF 10 — up to 5,500 gal","offer_id":47996437463189,"sku":"NGRDF10PP","price":1349.95,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ RDF 10 — up to 5,500 gal","offer_id":47996437495957,"sku":"NGRDF10SS","price":2974.95,"currency_code":"USD","in_stock":true},{"title":"Polypropylene \/ RDF 20 — up to 10,500 gal","offer_id":47996437528725,"sku":"NGRDF20PP","price":2269.95,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ RDF 20 — up to 10,500 gal","offer_id":47996437561493,"sku":"NGRDF20SS","price":3119.95,"currency_code":"USD","in_stock":true},{"title":"Polypropylene \/ RDF 30 — up to 16,000 gal","offer_id":47996437594261,"sku":"NGRDF30PP","price":2995.0,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ RDF 30 — up to 16,000 gal","offer_id":47996437627029,"sku":"NGRDF30SS","price":5295.0,"currency_code":"USD","in_stock":true},{"title":"Polypropylene \/ RDF 60 — up to 32,000 gal","offer_id":47996437659797,"sku":"NGRDF60PP","price":4575.0,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ RDF 60 — up to 32,000 gal","offer_id":47996437692565,"sku":"NGRDF60SS","price":7495.0,"currency_code":"USD","in_stock":true},{"title":"Polypropylene \/ RDF 80 — up to 42,000 gal","offer_id":47996437725333,"sku":"NGRDF80PP","price":5899.0,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ RDF 80 — up to 42,000 gal","offer_id":47996437758101,"sku":"NGRDF80SS","price":9795.0,"currency_code":"USD","in_stock":true},{"title":"Polypropylene \/ RDF 100 — up to 55,000 gal","offer_id":47996437790869,"sku":"NGRDF100PP","price":7739.95,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ RDF 100 — up to 55,000 gal","offer_id":47996437823637,"sku":"NGRDF100SS","price":10995.0,"currency_code":"USD","in_stock":true},{"title":"Polypropylene \/ RDF 125 — up to 65,000 gal","offer_id":47996437856405,"sku":"NGRDF125PP","price":8199.95,"currency_code":"USD","in_stock":true},{"title":"Polypropylene \/ RDF 150 — up to 80,000 gal","offer_id":47996437889173,"sku":"NGRDF150PP","price":10419.95,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ RDF 150 — up to 80,000 gal","offer_id":47996437921941,"sku":"NGRDF150SS","price":14680.0,"currency_code":"USD","in_stock":true},{"title":"Polypropylene \/ RDF 200 — up to 100,000 gal","offer_id":47996437954709,"sku":"NGRDF200PP","price":12369.95,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ RDF 200 — up to 100,000 gal","offer_id":47996437987477,"sku":"NGRDF200SS","price":18600.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0319\/4961\/9245\/files\/ngrdf30ss-leftprofile_1783289409.webp?v=1789448010","url":"https:\/\/mystickoi.com\/products\/gc-tek-nishikigoi-rdf-drum-filter","provider":"Mystic Koi \u0026 Water Gardens","version":"1.0","type":"link"}