Best CYA Level for Lots of Sun - Location Hawaii

[aylad]

If it immediately begins dropping, then I think you're probably fighting something in the water. With a CYA of 135, you need to shock it to 20, let it drift back down to 10, and keep it there.

Janet

[mbar]

Here is a copy of a post for draining your pool from the bottom with adding water to the top:

but...consider this....since you are looking for a major water change, some people have used a big plastic sheet to cover the pool as a separation membrane. If the width of the sheeting isn't enough you can tape sheets together using multiple layers of duct tape. Doesn't hold up long but will be good enough for the couple days it needs to hold. Cover the pool and start adding new water onto the top while you're draining out the bottom. 100% replacement. You never get a 100% replacement if the liquids mix. Another advantage is the water level never drops so you don't have to worry about floating the pool or liner. It does work. Saw a local with a new pool installation doing this last year.

[grangerhj]

Thank you for the suggestions. Now to get my husband to agree to let me do it!