The bac was fine for the first years...but it became more and more work and took more and more chemicals. Each year they ( Pool company ) had a new " something" to add. Then they changed the names, no more Check 50, it had another name....and then CDX which was another 4 gals. a month....and the pool just would not clear up....then when the pink water mold hit...Bacquacil offered nothing and I had to use a product called "Assist", which I'm sure was chlorine based. I used that twice then they took it off the market and you couldn't buy it. Last year when the white water mold hit, it was terrible and I fought it all year and closed the pool still fighting it. This year I found " Pink Treat" of which I used 12 lbs. over a three week period and each time I'd just blow debris out of my lines and the pool just got worse and worse...so that's when I found this website and of course the rest is history.