I have a 20,000 gallon pool and it has mosquitoes in it. We just replaced the Filter system. I wanted to see if I needed to drain the whole pool or if I could just treat the water to start using the pool for swimming. Please let me know what you recommend.

Question:

I have a 20,000 gallon pool and it has mosquitoes in it. We just replaced the Filter system. I wanted to see if I needed to drain the whole pool or if I could just treat the water to start using the pool for swimming. Please let me know what you recommend.

Answer:

You should be able to treat the pool and start swimming as long as the water is being circulated and treated properly. Also, often times even in significant problems, a complete drain and refill is not necessary. A partial, 1/3 or 1/2 is sufficient to bring good fresh water in to freshen up the old "dull" water.