what damage would it cause, this is our first pool (came with the house) and since the cover was taken off the ph level was always lower than 6.8, if i remember, the water didn't even change when I added the drops. The filter was an issue from the get go, and we finally desided to get a new filter. Now that the filter is hooked up the levels are climbing. But since the lvels were below 6.8 what kind of damage should I look for?