Hayward ProSeries W3S166T Sand Filter Tank (16 in., tank only)
Deepest owner proof in the category — and the clearest look at what the online warranty costs you — By far the most-owned tank here, on an unpadded base — 1,833 ratings with zero Amazon Vine reviews, which for a legacy brand at this volume is genuinely clean. What that depth buys you is an honest look at the failure rate and at what happens next: this listing's recent critical reviews are dominated not by the tank cracking but by owners who could not get the warranty to pay.
Specs
| Type | Tank only — no pump |
| Sizes | 16 / 18 / 21 in. (one listing) |
| Rated pool | Not published by the maker |
| Valve | Top-mount multiport |
| Sand | Not stated on the listing |
| Sold by | BackyardPoolSuperstore — plus 5 other sellers |
| Owner rating | 4.6★ / 1,833 (pooled, 16–21 in.) |
| Warranty (online) | 1 yr parts, no labor |
Pros
- 1,833 ratings with 0% Amazon Vine and 100% verified purchases — the deepest unpadded base in the category by an order of magnitude
- Lowest critical share of the two Hayward parents (4.6%)
- The ProSeries tank is the category's durability benchmark, and parts and laterals are widely stocked
- One listing covers 16, 18 and 21 in., so the size step-up is a dropdown rather than a hunt
Cons
- The 'W3' prefix is Hayward's ONLINE warranty tier, not a model variant — bought this way it is 1 year parts and no labour, whoever sells it
- The rating pools 16, 18 and 21 in., and the 18 in. dominates the visible sample — it is not a read of the 16 in. you would be buying
- Owners report the tank splitting at the seam by the valve neck, and the reports run continuously from 2017 to 2026 — a low rate, but not a fixed one
- The buy box rotates between six sellers, so who you actually buy from is not fixed
Two themes, and the louder one is not the tank. Owners report it cracking or splitting at the seam near the valve neck — and then report that the warranty did not pay. One completed every warranty requirement after the tank cracked at one year and was denied with no explanation; another describes being passed between Amazon, Hayward and Asurion.
84 of 1,833 ratings are critical (4.6%). Of the 10 most RECENT critical cards, 6 are a warranty or support failure and 2 more are the tank itself; they date 2024–2026, so neither theme is historical · critical reviews read August 2026
“Filter was easy to assemble and install. Instructions were quick and simple to follow. Got my pool back up and running after the original filter developed a crack.”— Jacob, Amazon · Verified owner
FAQ
Who is the Hayward ProSeries W3S166T Sand Filter Tank (16 in., tank only) for?
You want the tank the most people actually own and you are going in with your eyes open about the online warranty tier — or you are buying it to install yourself and were never going to claim anyway.
What do owners say about the Hayward ProSeries W3S166T Sand Filter Tank (16 in., tank only)?
4.6★ across 1,833 owner ratings (Amazon, read August 2026 · listing-wide base · global base). What owners complain about: Two themes, and the louder one is not the tank. Owners report it cracking or splitting at the seam near the valve neck — and then report that the warranty did not pay. One completed every warranty requirement after the tank cracked at one year and was denied with no explanation; another describes being passed between Amazon, Hayward and Asurion.
What is the warranty on the Hayward ProSeries W3S166T Sand Filter Tank (16 in., tank only)?
1 yr parts, no labor
✓ Safety: no active recall — No active CPSC recall found (checked August 2026)
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Data last verified: August 2026. Ratings are real, dated reads — never scraped or invented. Full methodology and monetization disclosure: how we test.