pH: Proper pH levels allow other chemicals to do their work.It is important to note that low and high levels can cause damage to the liner. Under the right circumstances with pH below 7.0, the liner can actually grow and develop unsightly wrinkles, staining of walls, chlorine loss, and skin/eye irritation. High pH greatly ac- celerates the aging process and shortens the life of the liner. High pH can also cause chlorine inefficiency, plugged filters, and skin/ eye irritation. Make sure to test your pH regularly with your test strips so these things can be avoided.