Split off of this topic. JasonLion
For a plaster pool, you need to avoid a negative CSI, or your plaster will be damaged. Go to http://www.poolcalculator.com/ to see your CSI. I see that you list an "Auto Chlorinator" as part of your equipment, but you don't list any salt level. What kind of auto chlorinator do you have? If it is a salt water chlorine generator, what is your salt level? If you are using a Trichlor feeder, I would recommend that you raise your alkalinity to at least 120 ppm by adding 12 lb. of baking soda. If you are using a salt water chlorine generator, you need to be careful to not scale up the cell with a too high CSI.