Oly
Gold Supporter
Most important is the FC/CYA Levels failure to follow this will result in sanitation issues. Each pool system is unique so rather than fretting about any "recommended levels" research your system, your water source and your unique seasonal patterns to develop your own ideal levels.
pH should be neutral and in the 7s and ideally stable over time but this depends on your system, get outside the 7s and you will have issues. If controlling pH is an issue then dive deeper and research your source water, pool type and chemical usage to understand your options.
Ideal CH ppm levels are unique to your system, too little can damage some surfaces, too much can damage all of them. Do your research on your fiberglass shell and coating to determine if it is affected by aggressive or low CSI water.
pH should be neutral and in the 7s and ideally stable over time but this depends on your system, get outside the 7s and you will have issues. If controlling pH is an issue then dive deeper and research your source water, pool type and chemical usage to understand your options.
Ideal CH ppm levels are unique to your system, too little can damage some surfaces, too much can damage all of them. Do your research on your fiberglass shell and coating to determine if it is affected by aggressive or low CSI water.