To keep pH from fluctuating after a fresh fill, use pH Lock. This product reduces maintenance and saves time.pH Lock is specially formulated to lock in the vital pH level of spa water, especially hard
water. pH Lock is intended for use in freshly filled spas, but can also be added to existing
spa water that is properly balanced.
If local water conditions are extreme or your spa usage is heavy, use pH Up or pH Down
to bring the pH into the range of 7.2 - 7.8. Once you have achieved the desired pH level,
then follow the directions above. Once pH Lock is added, it will lock in the pH level.