#chlorine

Swimming-pool water-chemistry maths as an API, computed locally and deterministically — the dosing and water-balance numbers a pool service tech or owner runs at every visit. The chlorine endpoint works out how much of a product to add to raise free chlorine from the current to a target ppm in a given volume: dose (g) = Δppm × litres / 1000 ÷ the product's available-chlorine fraction, with built-in strengths for liquid chlorine (12.5 %), household bleach (6 %), cal-hypo (65 %), dichlor (56 %) and trichlor (90 %), or your own — raising 50,000 litres by 2 ppm needs 800 g of liquid chlorine or 154 g of cal-hypo. The lsi endpoint computes the Langelier Saturation Index, LSI = pH + temperature factor + calcium factor + alkalinity factor − 12.1, the standard measure of whether water is corrosive (below −0.3, eating plaster and metal), balanced (−0.3 to +0.3) or scaling (above +0.3), with a cyanuric-acid correction to the carbonate alkalinity. Everything is computed locally and deterministically, so it is instant and private. Ideal for pool-service, spa, water-treatment and home-maintenance app developers, dosing and water-balance tools, and pool-care education. Pure local computation — no key, no third-party service, instant. Metric: litres, ppm (mg/L), °C. Live, nothing stored. 2 compute endpoints. Always confirm with a test kit — this is an aid, not a substitute. For pool water volume use a pool-geometry API.

api.oanor.com/poolchem-api

Swimming-pool maths as an API, computed locally and deterministically. The volume endpoint computes the water volume of a rectangular, round or oval pool — in litres, US gallons and cubic metres — from the dimensions and either an average depth or separate shallow and deep depths (it averages them), in feet or metres. The dose endpoint computes how much of a chemical to add to raise a level by a target ppm: give the pool volume and the desired increase, and either the product strength percent or a preset (cal-hypo, dichlor, trichlor, liquid chlorine, bleach), and it returns the amount in grams, kilograms, ounces and pounds. The salt endpoint computes the salt needed to reach a target salinity in a saltwater pool from the current and target ppm, in kilograms and pounds (and 40 lb bags). Everything is computed locally and deterministically, so it is instant and private. Dosing depends on the actual product strength and your test readings — always follow the product label, add in stages and re-test before adding more. Ideal for pool-service and maintenance apps, pool-builder and retailer tools, and smart-pool and home-automation systems. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is pool maths; for general volume or unit conversion use a unit-conversion API.

api.oanor.com/pool-api