Just painted my old 45 year old fiberglass pool and refilled with well water.

[BigDave]

I don't know about bulk Borax but remember that trichlor is self limiting and that as your CYA goes up so does your FC requirement - refer to Ben's Best Guess chart.

How are you aerating? If you could make the splashing more energetic, it could lower you Borax requirement since you TA is already so high.

[gwingard]

To splash my pool I simply have a length of flexible pipe screwed into the poolside water inlet that's aimed above the water surface. It's not exactly pretty but is reasonably energetic. It had been 8 years since I last fully drained the pool for painting and I'm sure that in that time a lot of CYA had accumulated in the water. As of yesterday I had manged to get the TA down to 230 but obviously I've still got a ways to go. I am going to more closely watch my CYA in the future and hopefully reduce my trichlor input which should also reduce my borax requirements. I've been a follower of Ben's for years and have always had good results. At this moment, despite the high TA, the water in the pool is the clearest I've ever seen. It's simply stunning. I guess it was due for a change!

Thanks,

Geoffrey