Hayward W3S244T2 Pool Sand Filter

The Verdict

If you’re staring at a cloudy above-ground pool and dreading another cartridge cleaning session, the Hayward W3S244T2 deserves your attention. This is the 19-inch ProSeries sand filter rated for above-ground pools up to 18,000 gallons — and after digging through 215 Amazon reviews, I can tell you exactly where it shines and where it’ll test your patience.

What’s actually in the box

You get the filter tank assembly, a top-mount 6-position multiport valve, pressure gauge, and the necessary O-rings. What you don’t get: sand. This unit needs 300 pounds of #20 silica sand, which will run you $60–$90 extra depending on your local pool supply pricing. The 19-inch tank stands about 26 inches tall with the valve installed, and you’ll need roughly 4 feet of clearance above it to lift the valve off for sand loading. Factor that into your install location before you start.

Real-world performance

The 2-inch plumbing and 1.5 HP pump compatibility make this a workhorse for its class. The top-mount valve is the standout feature — you rotate the handle to switch between filter, backwash, rinse, recirculate, closed, and winter positions. No tools needed, no wrestling with clamps. The pressure gauge sits right on top, so you’ll know exactly when backwashing is due (typically when pressure rises 8–10 psi above clean baseline).

One reviewer put it plainly: “Swapped from a cartridge filter and the water clarity difference was noticeable within 24 hours. Sand catches more than I expected.” Another noted the tank’s durability: “Left it out all winter in Michigan. No cracks, no leaks, fired right up in spring.”

What buyers consistently praise

The corrosion-proof thermoplastic tank gets consistent shout-outs — no rust streaks on decking, no paint peeling. The 6-position valve’s smooth rotation and positive stops come up repeatedly. Multiple reviewers mention that a single sand load lasts 3–5 seasons with proper backwashing, which makes the higher upfront cost worthwhile versus cartridge replacement every 1–2 years.

Where it falls short

The 2-inch connections are the biggest friction point. If you’re replacing a cartridge filter with 1.5-inch hoses, you’ll need adapters — and they’re not always included, which catches people off guard. One reviewer warned: “The unions are 2-inch. My existing hoses were 1.5. Had to buy two adapters and re-plumb a section.”

The diffuser (the part that distributes water over the sand bed) is the known weak point. If you overtighten it during initial assembly, it can crack. It’s a $15–$20 part if it happens, but it’s annoying on day one. Follow the torque specs in the manual — hand-tight plus a quarter turn is usually right.

Also, this is not quiet. Sand filters rumble. If your filter sits right outside a bedroom window, you’ll hear it cycle during backwashing.

Who should buy this

• Above-ground pool owners with 12,000–18,000 gallon pools — this is the sweet spot for the 19-inch tank.
• DIY installers — the plumbing is straightforward if you’re comfortable with PVC and basic tools.
• Swappers from cartridge systems — you’ll get better filtration and lower long-term costs, just budget for adapters.

Skip it if you have an in-ground pool (this is explicitly not rated for that), you’re on a tight budget this month (sand + adapters add $100+), or you have less than 4 feet of overhead clearance for the valve.

Frequently asked questions

Q: How often do I actually need to change the sand? A: Every 3–5 years for residential pools with normal use. Backwash when pressure rises 8–10 psi above your clean baseline. Many users report going 5+ years before noticing reduced clarity.

Q: Can I use glass media instead of sand? A: Yes, but it’s heavier and more expensive per pound. Stick with #20 silica sand for this unit — it’s what the warranty expects and it works well.

Q: Do I need to winterize this filter? A: Yes. Drain it, open the valve to the winter position, and leave the drain plug out. The tank survives freezing, but water trapped in the valve can crack it.

The verdict

Buy it if you want reliable, low-maintenance filtration for an above-ground pool and you’re okay with a slightly higher install cost for years of cheaper operation. Skip it if you have an in-ground pool, tight overhead clearance, or you’re not comfortable with basic plumbing work.

The Hayward W3S244T2 earns its 4.3-star rating. It’s not perfect — the diffuser fragility and 2-inch plumbing are real annoyances — but for the price point, it delivers consistent, clear water with minimal ongoing effort. Four stars from me, and a solid recommendation for most above-ground pool owners.

⭐⭐⭐⭐ (4.2/5)

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.