First time poster: I have a scale problem in my spa(what's the difference between a hot tub and a spa?). The scale which is dirty looking is probably CaCO3 with embedded sand.
Water Chem: pH-8.2, FC-2.5, CC-<0.5, TA-180, CH-250-300, CYA-0
A review of posts in this forum suggests that the best practical solution to scale removal is to drain and acid treat over the no-drain Jack Magic treatment. Correct?
Would it be worthwhile to lower pH and brush vigorusly?
I know the pH is high coupled with the Ca has probably led to the scale formation. Our water is very hard. The spa has been drained 2X and refilled, and the pH will bump up from 7.9 to 8.2 or more on its own. If I acid treat, do I need to keep the pH lower with acid on refilling? Also, the CSI is about +1.0. The water is very clear.
I'd like to hear from the experts on this.
Thanks and I've learned a lot from this site.