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Replacement parts for the Matala BioSteps II and original BioSteps 10
Current 2026 Matala part numbers for the BioSteps II (lid, tank, swivel-barb inlet, drain and outlet fittings, fitting bags, support bracket, UV nut/O-ring, Magic Adapter and the waterfall lip), plus the legacy fittings we still stock for the original BioSteps 10.
Image coming soon
Mystic Koi’s take
The “Fitting Bag – new style” (BSQF201001) is the one most owners need after a move or a rebuild — it has every barb and gasket for the II. Original BioSteps 10 owners: use the BHB-1003 bag and the (Original) fittings.
2026 parts list (BioSteps II unless noted)
| Part # | Description |
|---|---|
| BS201002 | Lid |
| BS201001 | Tank |
| ASYBS001 | Inlet Fitting Complete (include 1-1/2" o-ring x 2pcs) for BSTP 10 |
| BSAB201003 | New Inlet Fitting Swivel Barb 3/4", 1", 1.25", 1.5" for BSTP II |
| ASYBS002 | Drain Fitting Complete (include 1" o-ring x 1pc & 1-1/2' o-ring x 1pc) |
| ASYBS003 | Outlet Fitting Complete (include 1" o-ring x 2pcs) |
| BS201014 | Support Bar Steel Bracket |
| BSQF201001 | Fitting Bag - new style for BSTP II |
| BHB-1003 | Fitting Bag - Old Style for BSTP 10 |
| ASYBS004 | Nut & O-ring for EUV-16W connect to BioSteps |
| BS201022 | Magic Adapter for Biosteps (Option BSTP 16w EZClear UV and Drain Valve Connection) |
| WF | Waterfall for BioSteps Pond Filter |
Legacy / original BioSteps 10 parts
| Part # | Description |
|---|---|
| 2589 | Filter Body (Original BioSteps 10) |
| 2642 | Drain Fitting (Original) |
| 2641 | Inlet Fitting (Original) |
| 2643 | Outlet Fitting (Original) |
| PS201001 | Filter Body (II) |
| MBSPB | Hose Barb Kit (II) |
| 61021 | Replacement Fittings |
| 61015 | Waterfall Spillway |
Pairs well with
Questions we get about the BioSteps parts
How do I add the 16 W UV to my BioSteps II?
You need the EzClear EUV-16W plus the ASYBS004 nut & O-ring (and the BS201022 Magic Adapter on some units) to mount it on the inlet.
Is the waterfall the same for II and 10?
The WF waterfall lip fits the BioSteps II; original BioSteps 10 owners should call us to confirm fit.
Matala at Mystic Koi
Matala filter media and pond equipment have been a koi-keeping staple for decades, and Mystic Koi has sold and run Matala gear in our own systems since we opened in Upland, California in 1996. Everything on this page ships from Matala USA (Sea Life Designs) or our ¾-acre facility. Not sure what fits your pond? Call or visit and we’ll size it with you.