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Thanks, interesting posts. I do understand the multiport position and did a long backwash/rinse after changing the sand. There was no ´dust' coming back to the pool when i put it back to ´filter'. It took a couple days before i noticed big sand grain in the pool. It slowly accumulates so it is...

Hi, I know it is a reccuring question, but I did not found my answer in any previous person having this problem. I had sand in my pool and changed it because it was old (10 years) and started looking pretty brown and small. I tought it was the size that made it go throug the laterals. I...