Water Chemistry to reduce chalking

All Epoxy painted pools chalk.  That is the white oily power that sticks to the bottom of the pool.  It can not be eliminated but you can slow the chalking process down.

If your pool water chemistry is managed professionally, it is important that you specify the pool type as Epoxy Paint as opposed to fiberglass, or concrete, as this is the surface exposed to the water. Faulty specification can lead to chemicals being maintained at incorrect levels, and may result in faster rates of degradation and shorter life expectancy of the Epoxy coating. The four most important chemical levels that should be balanced for an Epoxy pool are Total Alkalinity (TA), pH, Calcium Hardness (or just Hardness), and Chlorine.

Total alkalinity (TA): Adjust close to 180ppm, and maintain within the range 140-180 ppm.

The TA balance is most critical to extending the life of an Epoxy coating, so it should be checked regularly, and maintained in this range all year round. TA levels lower than 140ppm are likely to lead to early degradation of the epoxy coating. Low TA may be indicated by white powdery deposits on the coating surface, or early pick up of color on the feet of pool users. When using Cyanuric Acid stabilizer, take care not to exceed 55 ppm, as this will give a false reading of TA.

pH: Adjust close to 7.6, and maintain within the range 7.4-7.8.

Calcium Hardness: Maintain within the narrowest possible range between 280–320 ppm.

Chlorine: Keep under 3ppm, ideally between 1-2ppm.