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Card 657 of 9902026-09-17 issue

Observed arrival · 2026-09-17

PoolLevels: pool chemistry without the guesswork

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Editorial interest 78/100 Selection signal · not a rating of the site

A privacy-first pool-water calculator that uses test readings to estimate saturation index and recommend one measured chemical addition.

Landing page captured for the 2026-09-17 issue.

Field notes

PoolLevels models pool chemistry from pH, alkalinity, calcium hardness, cyanuric acid, temperature, pool volume, and related context, then presents a single dose with checkable arithmetic. Its worked 20,000-gallon example produces a +0.54 saturation index and a 52-fluid-ounce muriatic-acid recommendation. The page also documents an important limitation: dissolved solids are assumed rather than measured, while photo-based strip reading remains disabled pending laboratory-reference testing.

Observed signals

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Editorial observations of this landing page, not a rating.

○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use

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Landing page observed 2026-09-17. The live site may have changed.