Partially draining vinyl liner pool - high cya

[steve1staf]

I haven't had to post on here in a while because this forum has taught me so much and my pool is crystal clear! This post is actually for a friend of mine that I'm helping out. Their CYA is above 100 so I told them that there only option is to do a partial water replacement and then SLAM. My question is, I would like them to replace half the water in the pool but they have a liner pool with two sun shelves, how much water can they remove without affecting the liner on the sun shelves. Should they do it in phases or drain half the pool all at once? Here are some pics of their pool for your reference. As always, thanks for your help!

 

[wireform]

Even just draining the sunshelf could be risky. I would recommend a water exchange.

 

[steve1staf]

Even just draining the sunshelf could be risky. I would recommend a water exchange.

So they are using a very small sump pump dangling half way in the pool. Could they put the garden hose down the other end and do a water exchange that way?

 

[mknauss]

Follow the exchange process in Draining - Further Reading

 

[steve1staf]

Thanks for pointing us in the right direction. The water exchange went perfect and their pool is looking great!