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.
Primary part on file
DGD-7525
Pentek dual-gradient sediment cartridge
Replace about every 6 months
DGD-7525 may fit model 158129, but compare the part number carefully before you buy.
Why this part
- 14 mapped replacement cartridge options for this whole-home system model in our reference
- Notes available for this part
- No BuckParts Verified Link yet for this filter number. We haven’t found a retailer product page we’re comfortable showing.
Replacement cartridge fit for this system model is based on our reference data.
Do not buy yet until you verify your system or housing model number and the cartridge number against the part you are removing, your housing specs, or your owner’s manual.
BuckParts Verified Links
A place to buy that BuckParts has checked against the part, listing, and evidence we trust. Not every filter page has one—we only show a link when our checks clear for this part number.
BuckParts does not have enough proof to show a buy button for this replacement cartridge yet. Verify the cartridge number and dimensions against the cartridge you are removing or your housing specs first.
- Some listings did not pass our safety review for now, so those stay hidden.
All details for this part (notes, compatible models, BuckParts Verified Links when listed)
Other parts that also fit this model
Less common crosses — open each for full part details.
- CC-20BBPentek coconut shell GAC cartridge
- CW25-BBCulligan Level 4 sediment cartridge
- ECP20-BBPentek pleated sediment cartridge
- EP-20BBPentek carbon block cartridge
- EPM-20BBPentek carbon block cartridge
- GAC-20BBPentek granular activated carbon cartridge
- PCC-20BBPentek phosphate crystal cartridge
- R30-20BBPentek pleated sediment cartridge
- RFC-20BBPentek radial-flow GAC cartridge
- RFFE20-BBPentek iron reduction cartridge
- TO-20BBPentek organic / tannin reduction cartridge
- W20FFPHDWatts phosphate / scale inhibitor cartridge
- WP25BB20PPentek string-wound 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.