Search·Pentek
When you know your system or housing model number, this page lists the replacement cartridges we match to it—compare length, diameter, and micron rating before you order.
Brand
Pentek
Model 158129
Pentek #20 Big Blue housing (alt port layout)
Series: Big Blue
These cartridge numbers are matched to this system model in our reference. Compare length, diameter, and micron rating with the filter you’re removing or your housing specs before ordering.
Best match first
W20FFPHD
Watts phosphate / scale inhibitor cartridge
Replace about every 6 months
All details for this part (notes, compatible models, buying options when listed)
Other parts that also fit this model
Less common crosses — open each for full part details.
- DGD-7525Pentek dual-gradient sediment cartridge
- ECP20-BBPentek pleated sediment cartridge
- WP25BB20PPentek string-wound sediment cartridge
- RFC-20BBPentek radial-flow GAC cartridge
- EP-20BBPentek carbon block cartridge
- GAC-20BBPentek granular activated carbon cartridge
- CC-20BBPentek coconut shell GAC cartridge
- EPM-20BBPentek carbon block cartridge
- TO-20BBPentek organic / tannin reduction cartridge
- PCC-20BBPentek phosphate crystal cartridge
- RFFE20-BBPentek iron reduction cartridge
- R30-20BBPentek pleated sediment cartridge
- CW25-BBCulligan Level 4 sediment cartridge
Notes & next steps
Search again if you need a different model or part number.
20 x 4.5 in. sump compatible with standard BB20 cartridges — compare stamped ports to your existing head.