Within the last week or so, the water level in my pool has risen about 2". I have a 23,000 gallon, in ground, gunite pool. It is fairly old, but I'm not certain how old exactly. The house we just bought, was built in '79. I'm not sure how it could be rising by itself. It hasn't rained in months (Northern California drought), it's not my sprinklers adding water. Where would this water be coming from? It's almost up to the deck at the moment. I will need to use this chance to backwash my filter with the extra water.