Swimming pools blog

Your first line of defence is the chlorine you use to sanitize the pool.
Next is the high dose of chloring you use to shock the pool. Next is a
product that has been on the market several years and it is used to remove
phosphates from the water. Phosphates are a componet of plant food so if
there is a high concentration in the water then removing them will be a big
step in controlling algae. Last but not least is and algecide of some type.
Some contain copper and should only be used as a last resort when all else
fails. Hope this helps.