We bought a house last year that had been vacant for a couple years & the pool had frogs & tadpoles in it. We had it drained, acid washed & re-filled. Had the filter cleaned & all the equipment was working. We had no idea how to maintain the pool & never got algae under control. Finally gave up & let it go green again over the winter. I started dumping "shock" in it this spring with little results. Went to the pool store & they sold me a 25lb. bucket of "shock" & said to dump the whole thing in. It made a significant difference. Then I did some serious internet study & found the BBB method. It makes so much sense! I went to Leslie's & bought a DPD test kit- #2004B. The 1st time I tested I got 1 FC, 2.5 TC, pH 7.4, & added 256 oz. 6% bleach. Next 3 testings appeared to be less than .5 FC, 1 TC, pH 7.3. CYA test: dot in tube never disappeared, so less than 30? Help please.