Slow Water on Return and Backwash

[janmo]

I hope I am not hijacking your thread, Mohawk, but wanted to add that mine is making a swooshing sound at the top of the filter...like shoosh-shoosh and it causes the pipes to shake a bit when it does this. Also, when that storm came through a large iron table was blown into the pool and it broke the drain cover so the drain has been half exposed. Could something have gotten into the drain that is causing this? I still consider myself a 'newbie' so am not sure exactly how everything works..... I just let it backwash for about 30 minutes and it hasn't helped. I think the swoosh is the problem but not sure what is causing it. Air? Debris in the sand?

Janis

[mohawk]

I had the pool store come out again and they changed out the multi-port but it didn't help the problem. Next they started to change out the sand. I was told that down next to the laterals were quarter sized sand chunks-which were impeding the water flow. They wanted to know where I had been getting my chemicals. Thankfully, their shock has been cheap this year so I could say it was from their store. These chunks had formed within a few months. Anyone have any ideas why? I've only been using chlorine. The pump works great now, I just don't want this to happen again in a few months. Denise