A stabilizer in your pool prevents loss of chlorine loss. Chlorine in water dissipates due to sunlight. You will mainly use the stabilizer if maintaining chlorine level is difficult due to intense sunlight. The ideal range of a stabilizer is 40-50 ppm. During summers, when sunlight is intense, it is wise to take the level up to 100 ppm (between 80-100). This will enable the chlorine to hang around in the pool water for a longer period of time. To keep the level/range of the stabilizer is important on hot summer days because the UV rays from the sun consume chlorine in the pool.