I have a Hayward pro series high rate sand filter. The model number is S244T. My pool in a 20 X 40 unground with vinyl liner. This will be our third summer with the pool. We opened it a couple weeks ago and had some algae but not to bad(thank you cooler temps). We had been cleaning it and my husband backwashed it and he said quite a bit of sand came out. He backwashed it again at another time and he said "a lot of sand came out" through the hose.
As I was looking this up, I was reading through other threads and they asked if it came to in the pool. Im not sure ..but now we think maybe? We had dirt in the pool that we vacuumed. The dirt was back and my husband was saying...I just vacuumed this..how could there be dirt. So I don't know if it's possible it could be sand? Or it could just be dirt. I have read it could be a lateral something or other(not sure of the name). How expensive is it to replace these? I would think the sand wouldn't need to be changed yet? I read that would be another reason it could happen? I am just hoping it isn't something really expensive.