Splash: Chlorine Pool Care

Pay once for Pro. No subscription, no ads, no account. Works offline.

Splash is the iOS chemistry assistant for chlorinated freshwater pool owners. Enter your test readings — free chlorine, pH, total alkalinity, calcium hardness, cyanuric acid, water temperature — and get exact doses scaled to your pool volume. Source-aware: pick your chlorine source (trichlor tablets, cal hypo, dichlor, liquid bleach) and Splash factors how each one moves CYA and CH alongside the chlorine.

Why source-aware matters: every pound of trichlor tabs adds about 6 ppm of cyanuric acid to a 10,000-gallon pool. Most pool apps recommend "shock with trichlor" without forecasting where your CYA will be in eight weeks. Splash projects CYA forward based on your dose history and warns you before the pool chlorine-locks.

Features
• Test & Adjust: 6-parameter readings → recommendations with brand-cited dose math
• Source-aware dosing for trichlor, cal hypo, dichlor, and liquid bleach
• CYA trajectory: forecasts where your stabilizer will be in 4 / 8 / 12 weeks
• FC/CYA active-chlorine visualizer — what percent of your FC is actually sanitizing
• CSI (Calcium Saturation Index) — scale vs etch risk indicator
• SLAM mode — TFP-validated algae recovery walkthrough with FC target by CYA
• Brand-cited dose math for HTH, Clorox Pool & Spa, BioGuard, Pool Essentials, Leslie's, In The Swim, and generics
• Pool volume estimator for rectangular, round, oval, and kidney shapes
• Named-source citations: Trouble Free Pool methodology, manufacturer documentation
• Universal app for iPhone and iPad

For pool owners who don't want to memorize forum threads. Chlorinated freshwater pools 1,000–100,000 gallons.

Free download with the basic liquid-bleach calculator unlocked. $6.99 one-time unlocks Splash Pro permanently — source-aware dosing for trichlor / cal hypo / dichlor, CYA trajectory, FC/CYA visualizer, CSI, and SLAM mode. No subscription, no ads, no account, no cloud.

Privacy: Splash collects nothing. No analytics, no accounts, no network requests. Your settings live on your device.

Have a saltwater pool? Look up Saline by the same developer for cell-aware saltwater chemistry.