I recently bought a house that has an in-ground plaster pool. It's my first pool, so I'm learning as I go along and trying to get things right. As such, I'm also a little paranoid. The previous owner moved out months ago, so the pool has largely been left to itself for quite a while (fortunately it's been winter). The water is still very clear. However, after taking my first reader I discovered that my PH is 6.7. It's likely been that low for quite a while. A lot of the initial reading I've done says that a PH that low can cause damage to the pool, including pipes, seals, the lining, etc. I'm concerned that maybe the pool has sustained damage if it's been that acidic for months on end. Should I be worried and what should I do (besides obviously correcting the PH immediately)? Thanks!