My husband set up a Intex 10x30" easy set pool for our kids last weekend but hasn't added any chemicals since we were unsure what exactly we needed. After doing some calculations I believe we have a little less then 1,500 gallons. I read on Amazon some people use a chlorine tab. dispenser for this size pool and I've read a few threads on here saying you can use bleach instead of chlorine, but how does one determine the amount needed? Also since the pool has been up for a week already without chemicals do we need to empty it and start over? This is the first time we have had a pool that doesn't get emptied after each use so any insight to maintaining a pool like this would be greatly appreciated!