That is a very easy one to answer, it’s because you don’t have enough chlorine in the pool!

It is a common fallacy that if you can smell chlorine there is too much in the pool, in fact the opposite is true and here is why. People bring into the pool wastes that the filter has difficulty filtering out, mainly because they are not solids, such as perspiration, suntan lotions, cosmetics, urine, saliva and laundry detergent residues. 

Some of these wastes give off Nitrogen which combine with the chlorine to form what is known as Chloramines. It is these Chloramines that give off the unpleasant chlorine smell and cause skin and eye irritations. Correct this with Pool Pro Impact which is an oxidizer that burns out these wastes, or Superchlorinate using one of the many Pool Pro Chlorine Products designed for shock treating and superchlorination. Your Pool Pro Professional can advise you which one to use for your particular pool. Ensure your filter is kept working efficiently by cleaning your filter regularly. For Cartridge Filters, use Pool Pro Filter Cleaner and Degreaser. For Sand Filters backwash when your pressure gauge tells you it is time to backwash. 

AS WITH ALL CHEMICALS KEEP OUT OF THE REACH OF CHILDREN AND STORE IN A COOL DRY PLACE. NEVER MIX CHEMICALS AND NEVER ADD WATER TO CHEMICALS, ALWAYS ADD CHEMICALS TO WATER.