In-Ground Cartridge Filters matchup
Pentair Clean & Clear Plus 420 sq ft Cartridge Filter vs Waterway Crystal Water 425 sq ft Cartridge Filter
the $44 that decides it — and the star rating points the wrong way
Tale of the tape — this fight hasn't been booked yet
No showdown has ruled between these two. What follows is the verified data, not a verdict.
Ringside notes
Forty-four dollars separates these two, and on star rating the Waterway wins: 4.4 across 34 against the Pentair's 4.2 across 59. Buy on that and you would take the Waterway. We did, when this roundup published, and then we read the complaint tails and moved the belt. We read the critical reviews of every filter in this roundup signed in on one day, and the rate is the finding: Hayward SwimClear 325 2.7%, Pentair Clean & Clear Plus 320 2.9%, Hayward SwimClear 425 4.9%, Pentair Clean & Clear Plus 420 15.3%, XtremepowerUS 425 14.8%, Rx Clear 425 16.1%, Waterway Crystal Water 425 20.6%, Waterway Crystal Water 325 22.6%. No Vine reviews on any of them. The Pentair 420 and the Waterway 425 sit at 15.3% and 20.6%, which looks like a small gap until you read what is inside each one. Every one of the Pentair's nine critical reviews is the unit arriving damaged — a big bulky box that shows up smashed with hardware missing, a cracked foot, a broken pressure gauge, a top housing damaged in transit. That is discovered on day one and it is the seller's problem to fix. Every one of the Waterway's seven is the tank failing in service at two to three years: hairline and full cracks in the base, one owner reporting it flooded their own and a neighbour's yard, two who found out only when the water bill doubled, and one who recorded the maker's answer verbatim — “we only warranty our filter”. Same order of magnitude, opposite consequence. The Pentair also carries a stated warranty and NSF/ANSI 50 certification the Waterway listing does not claim, though the warranty is prefix-dependent: one year on the EC- SKU, sixty days on the plain TradeGrade SKU bought online. Two honest catches on the Pentair. It needs sixty-eight inches of vertical clearance to pull its cartridges, which quietly rules out a lot of equipment enclosures, so measure before you order. And it swings in price more than anything else in the category — we found the identical EC- SKU at $1,324 on Amazon and $1,619 at two dealers on the same day.
Tale of the tape
| Model | Best for | Warranty | Price |
|---|---|---|---|
| Best value | 1 yr parts on the EC- (eCommerce) SKU. The plain TradeGrade SKU bought online gets 60 days. | ~$1,324typical at AmazonCheck price → | |
| Reads well, fails in year three | Not stated on the listing — confirm with the seller | ~$1,280typical at AmazonCheck price → |
Prices move constantly — any Amazon price shown is as of the date noted and subject to change; tap through for today's number.
Prices move constantly — tap through for today's number.
What would decide it
- Owner proof: Pentair Clean & Clear Plus 420 sq ft Cartridge Filter reads 4.2★ across 59 owners; Waterway Crystal Water 425 sq ft Cartridge Filter reads 4.4★ across 34. Depth of sample matters as much as the star.
- The money: Pentair Clean & Clear Plus 420 sq ft Cartridge Filter streets ~$1,324, Waterway Crystal Water 425 sq ft Cartridge Filter ~$1,280 — MSRPs, not sale lows, decide the tier.
- Pentair Clean & Clear Plus 420 sq ft Cartridge Filter — your pick if: you want four-element filtration without paying Hayward money, and you would rather risk a box arriving smashed than a tank cracking in year three.
- Waterway Crystal Water 425 sq ft Cartridge Filter — your pick if: almost nobody at this price. It is the same construction as the majors and it reads 4.4★, but every critical reviewer we could read describes the same thing: the bottom of the tank splitting at two to three years, discovered by a doubled water bill, out of warranty.
The full cards
Your pick if you want four-element filtration without paying Hayward money, and you would rather risk a box arriving smashed than a tank cracking in year three.
“Good price, good quality. Manf packaging sort of sucks, not meant for this type of shipping, other places wanted to ship freight. I got this one from ups, box was beat to hell but everything was in there, so I'm happy.”— Frank, Amazon
- 420 sq ft at the lowest price per square foot of any major in this roundup
- Its critical reviews are almost entirely shipping damage — visible on day one and recoverable, not a failure that shows up in year three
- Deeper base than the cheaper quads it competes with: 59 owners against Waterway's 34
- The EC- SKU carries a full year online where the plain TradeGrade SKU gets 60 days
- 150 GPM maximum flow, certified to NSF/ANSI 50
- 4.2★ across 59 — the thinnest base of the three Pentairs
- 15% of its reviews are critical, and the recurring story is a big bulky box arriving damaged with hardware missing
- Needs 68 inches of vertical clearance to service, which rules out a lot of equipment pads
- Sells for $1,619 at some dealers and $1,324 on Amazon — shop the same SKU before you buy
- One owner reports the warranty requires a licensed pool company to have installed it
Arrives damaged — a shipping problem, not a service-life problem
9 of 59 ratings are critical (15.3%), and six of the nine are the unit arriving damaged rather than failing in service · critical reviews read August 2026
Waterway Crystal Water 425 sq ft Cartridge Filter
Reads well, fails in year threeYour pick if almost nobody at this price. It is the same construction as the majors and it reads 4.4★, but every critical reviewer we could read describes the same thing: the bottom of the tank splitting at two to three years, discovered by a doubled water bill, out of warranty.
“Great product, still filtering after 2 years. Easy to take apart and reassemble at filter changes or cleaning. Cartridges are reasonably priced for annual replacements.”— Michael, Amazon
- Four cartridges at 425 sq ft, confirmed by Waterway's own parts list — genuinely the same construction class as the majors
- About $539 under the Hayward at identical filter area, and about $800 under it on Waterway's second listing
- No free-product reviews in the base, and no size variants pooled into the score
- Seven of seven readable critical reviews describe the tank bottom cracking, most at two to three years
- Owners report the failure is found only when the water bill doubles, and that Waterway declines the claim as out of warranty
- A 20.6% critical rate against 2.7% and 2.9% on the two filters we do recommend
- 34 ratings is a shallow base for a pressure vessel you expect to own for a decade
- Waterway publishes no warranty term on the listing, which owners say they discover only when they claim
- Amazon carries this exact model under two listings at different prices and different scores — 4.4★ on one, 3.3★ on the other, about 4.0★ combined
The tank bottom cracks at two to three years and the claim is refused
7 of 34 ratings are critical (20.6%) and every readable one describes the tank bottom cracking at two to three years; four of the five recent crack reports are not Verified Purchase, which fits a filter usually fitted by an installer · critical reviews read August 2026
FAQ
Is the Waterway Crystal Water 425 a good filter?
It is genuinely the same construction as the majors — four cartridges at 425 square feet, confirmed against Waterway's own parts list — and it reads 4.4 stars, higher than the Pentair we recommend instead. The problem is what the critical reviews say. All seven we could read describe the bottom of the tank cracking, most at two to three years, with owners reporting the failure is found when the water bill doubles and that the claim is refused as out of warranty. It held our best-value slot when this roundup published and lost it when we read them.
Why does a filter with a higher rating lose?
Because a star average blends the satisfied majority with the failure tail, and on these two the tails are not comparable. The Pentair's complaints are almost entirely shipping damage — visible immediately, fixable through the seller. The Waterway's are the pressure vessel splitting after the warranty ends. Averaging both into one number hides the difference, which is why we publish the critical rate and what is inside it rather than ranking on stars.
Is $44 worth it?
On these two, yes, and it is the clearest-cut spend in the category. Forty-four dollars is roughly three percent of either filter's price and buys you a complaint tail made of recoverable delivery problems instead of one made of cracked tanks. It also buys a stated warranty and an NSF certification the cheaper listing does not claim.
Full fight coverage
Every number on this page derives from the same verified data that renders our showdowns — dated owner-rating reads, MSRP-based tiers, and rulings only where a real fight happened. Data last verified: August 2026. Methodology and monetization disclosure: how we test.