The answer — one pick, priced
Get the
Polaris 9550 Sport
no budget ceiling
For the full-size family pool: a corded workhorse with a 70 ft swivel cable and big-pool suction, rated to 60 ft — where the 50 ft class runs out of reach.
Fit ledger — need → measured evidence
■ The catch — co-equal billing, always
It is only ~$100 more than the better all-rounder. The Dolphin Nautilus CC Plus filters finer and has the smarter app; the 9550 Sport earns its price only if your pool is genuinely 50-60 ft. In a standard pool you are paying for cable you will never unspool.
Dealbreaker? Runner-up №1 is the better buy under 50 ft ↓
■ Every product has a catch. Verdicts that hide it are how bad buys happen.
Don't buy this if…
- you want an indoor robot vacuum for floors/carpet, not a swimming-pool cleanerrobot vacuums under 500 dossier →
- you want a robot that mops hard floors inside the homerobot vacuum mop combos dossier →
- you need a wet/dry shop or floor-washing vacuum for spills and garage cleanupWet-dry vacuum floor washer verdict →
- you only want a surface skimmer for floating leaves, not a full floor/wall vacuum
Wrong product for you is still a bad buy. These are the cases where we'd send you somewhere else.
Runners-up — if your needs differ
Adjacent verdicts — other needs, same method
Different budget, different household, different job — each of these is already researched, priced and verified. Take the one that matches your need.
Traps — this verdict avoids
Why the Polaris 9550 Sport is right for you
It avoids every trap below — and for family of 4, no budget cap, it is the pick because it delivers:
The charging fire
Cordless robots run on lithium-ion. The CPSC recalled roughly 22,000 Aiper Elite Pro units for overheating and short-circuit, and individual charging fires have been reported. Poolbots reports never encountering a corded robot fire.
The suction gap
Battery robots push roughly 2,000 GPH through coarse mesh screens. Corded robots push 4,000-4,500 GPH through 2-micron NanoFiltration. Same price no longer means the same clean.
Phantom coverage
Quoted square footage and pool-length ratings assume a rectangular inground pool. Freeform shapes, steps and sun-ledges cut real coverage, and several cordless units are reported to get stuck on steps.
Provenance — 8 sources, dated
Winners are picked from the full research dossier at knowledgelib.io. Prices, stock and listings are re-verified monthly.