Replacing water to get rid of CYA

[BillyBumbler]

So, if you shouldn't completely drain a pool because ground water might push it up, how do you resurface a pool when it's time?

[cwstnsko]

I believe one option is to dig a sump next to the pool and pump off ground water continuously during the refinishing process. In some areas, careful choice of the time of year to do the refurb can help.

[waterbear]

I'm thinking of the vacuum hose setup that hooks to the skimmer. Should be able to hook it as you would for vacuuming but set the valve to waste and leave the hose in the deep end of the pool.

Can't vacumn to waste with a cartridge filter. I had to partially drain and refill my pool when they set up the SWG because they dumped in too much salt and my cell shut off with a high salt warning. I used a submersable aquarium pump (a very large one) and drained a foot below the skimmer. I then refilled and had to repeat this 3 times to get my salt levels in line. It is not necessary to drain all at once. You can drain a foot and refill until the CYA levels are where you want them.

[makodav]

Unless your pool is sitting way low you should at least be able to get a gravity flow drain going using a couple garden hoses. Run the water from the garden hose into the pool and run another garden hose out the pool. Get a flow going into the hose leaving the pool for 20 seconds and then the flow should continue. Also you can always use your filter pump but not through your usual vacuum setup through the skimmer. If you submerge the hose that usually goes to the skimmer under water you can pump water out of your pool for ever with your return line going to where you want to drain!