Free Chlorine Low After Shocking Pool. This is a common problem that many pool owners face at some point in time. Even acid rain and other biomatter getting into your pool will cause free chlorine levels to drop.
Last night we shocked the pool, had filter running most of night (and day) and my test strips are showing the free chlorine to still be really high. Add a chlorine neutralizer like sodium thiosulfate ; If it is low, you will use a chlorinated shock.
The first three times the level went up to 10, then back to almost zero by the next day.
Even acid rain and other biomatter getting into your pool will cause free chlorine levels to drop. If it is low, you will use a chlorinated shock. Pool owners should shock their pool after having large bather loads. After the shocking process (which kills the harmful contaminants), you need to run the filter to remove them from the pool water.
