Customize chemistry targets
Open chemistry settings
Settings → Service → Chemistry Targets. You'll see per-sanitizer min/max ranges for each parameter (pH, FC, TA, CYA, CH, salt).
Edit defaults
Click any value to edit. Changes apply to all pools using that sanitizer.
Automatic surface awareness
DeweyIQ tightens calcium hardness targets automatically based on each pool's surface type — no extra setup. Plaster, pebble, and tile use 200–400 ppm (cementitious surfaces need calcium to stay in equilibrium and avoid etching). Vinyl and fiberglass use 150–250 ppm (non-porous surfaces don't need high calcium and stain or scale at higher levels). Make sure each pool's surface is set on its profile.
Resolution order
When DeweyIQ classifies a reading, it picks the target range like this: your custom org overrides win → then surface-specific tightening → then built-in CPO defaults. So a custom Settings value always takes priority over the surface default if you want to override it.
What drives recommendations
Targets feed into LSI/CSI, the balanced/adjust badge, and the dose recommendations the field tech sees. Tighter targets = more 'adjust' flags. They also feed the predictive-chemistry alerts on the Alerts page.
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