OK, kids got in to swim this evening, cloudy water and all. They said the bottom felt clean. I then added 2 gallons of bleach and then brushed the bottom to be sure it was all stirred up. Walmart was out of Borax so I got the Washing Soda instead. I also got Baking Soda just in case. They also did not have any filter socks but I will get some.

I'll report more in the morning.