How ofter does your pool change water?

That's why they have the chemicals and filters to help keep the water safe. I'm sure you can suggest more frequent change but that doesn't mean they'll do it. And how often would you suggest? And that's also A LOT of water for them to add

AFAIK that is pretty normal. And that's why you (and all other users) should shower before they enter the water, use a cap while swimming, not use the same swim trunks as for the beach, not pee in the water ... etc.

My local Y's just did theirs as well. My regular one is now 2 weeks post-cleaning. Clarity is still good, and taste is very heavy chlorine, so I guess that's good.

once a year at my pool, but sometimes they will drain it down 6-12 inches and fill it back up. It's not a lot but it's something

My old pool would close it down every 6 months for a few days for a deep clean and maintenance. I don't know if they were steaming or pressure washing it but they had guys in rubber suits spraying the walls of it.

Reviving an old thread here.

You'd be surprised at the amount of water that is replaced through every day use and routine filter cleaning. For indoor pools, the main source of water replacement is splash/carry out (people pulling water out of the pool when they get out). Also, water is replaced every time the filter is backwashed (varies with the type of filter, but still the same concept) -- the flow of water is reversed through the filter and the waste goes down the sewer line. Either way, water lost is replaced with water from the city line.

The main purpose of the yearly drain is to clean the white coat of the pool from any build up/staining that occurred throughout the year. A happy side effect of that drain and refill is starting over with a clean slate chemical wise. If not properly maintained, certain chemical levels (TA, CH, and TDS) can wreak havoc on water quality, equipment life, and swimmer comfort.