Pentair 178578 Almond Bottom Tank Assembly Replacement Pool

The Verdict

If your Pentair Clean & Clear Plus filter tank has developed a hairline crack near the base or the stand has snapped off after years of service, you’ve already priced out a full replacement system and winced. The Pentair 178578 Almond Bottom Tank Assembly is the fix that costs a fraction of a new filter — and it’s the part most pool owners don’t know exists until they need it.

What’s Actually in the Box

This is the bottom half of a two-piece tank assembly for the Pentair Clean & Clear Plus line (CCP320 and CCP420 models). You get the molded bottom tank with the integrated stand base, plus the sump drain plug pre-installed. It’s genuine Pentair OEM — not a knockoff — which matters more than you might think with pressurized filter housings. The almond color matches the older Pentair systems perfectly, though it’s worth confirming your top tank is also almond before ordering.

Build Quality and Real-World Performance

The plastic is thick, rigid, and feels substantial in hand — this isn’t the thin, flexy material you see on cheaper aftermarket parts. Pentair injection-molds these with a specific wall thickness to handle the 50 PSI operating pressure these filters run at, and the threaded collar where the top tank locks on is machined cleanly. No flashing, no warping, no gaps.

Installation is straightforward if you’ve done basic pool maintenance. The tank bolts to your equipment pad through the molded feet, and the top tank twists onto the threaded ring with the same locking mechanism as your original. The whole job runs about 30 minutes including draining the system. As one verified buyer put it: “Dropped right in, sealed perfectly, and my filter is back to running like new. Wish I’d found this part a year ago instead of buying a whole new filter.”

What Buyers Consistently Praise

The 4.6-star average across 229 ratings is backed by recurring themes. Fit is the big one — buyers repeatedly note that this is an exact OEM replacement that requires zero modification. Longevity gets mentioned often too, with several reviewers running theirs for multiple seasons without any warping or UV degradation. The pre-installed drain plug saves a step, and the integrated stand means you don’t need to source a separate base.

Where It Falls Short

The price stings compared to generic alternatives — you’ll pay a 30-40% premium for the Pentair name. For a part that sits outside in the elements, that markup is harder to swallow than it would be for an indoor component. Also, this only solves half your filter housing problem. If the top tank has issues, you’ll need a separate part, and the almond color is a hard match requirement — white systems can’t use this without looking mismatched. Finally, the box contains no gaskets or O-rings, so a complete rebuild means ordering those separately.

Who Should Buy This

This is for the DIY pool owner with a cracked or failing bottom tank who wants OEM reliability without replacing the entire filter system. It’s also the right call if you’re buying a used filter setup and want to replace the bottom tank proactively. If you’re on a tight budget and don’t mind gambling on aftermarket fitment, you can save money — but you’re betting your filter’s pressure seal on a cheaper mold.

FAQ

Q: Will this fit my Pentair CCP320 or CCP420? A: Yes, this is the correct OEM bottom tank for both the CCP320 and CCP420 Clean & Clear Plus models. Verify your top tank is almond before ordering.

Q: Does it come with gaskets or O-rings? A: No. You’ll need to purchase the tank O-ring and any needed gaskets separately. Many buyers order the Pentair O-ring kit at the same time.

Q: Can I use this with a white top tank? A: Technically yes, but the color mismatch will be obvious. This almond part is designed for older Pentair systems that shipped in almond.

The Verdict

Buy it if: You need a genuine OEM bottom tank replacement that will fit perfectly and last for years. The peace of mind knowing your filter housing won’t fail under pressure is worth the premium over generics.

Skip it if: You’re working with a white system, you’re on a strict budget and willing to gamble on aftermarket fit, or your top tank also needs replacing — in that case, a full assembly might make more sense.

Rating: 4.6/5 — A solid, dependable OEM part that does exactly what it claims. The price and lack of included gaskets keep it from a perfect score, but for fit and durability, this is the part to get.

Where to Buy

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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.