Quote Originally Posted by Watermom View Post
Do you have the manual that came with your SWCG? Most of the manufacturer's of those units have specific requirements. Your pH is high, but your alk is ok at 100. Your calcium hardness is pretty high at 425. I wouldn't use any products with calcium in them in your pool. Read through some of the posts in the SWCG section of the forum. Hopefully one of our members who knows more about SWCG requirements than I do will chime in here later today.

Go ahead and post some details about your pool ----- type of pool, volume, type of filter, what you have added to the pool.
Actually, using an estimated pool temp of about 85 deg (which gives a SI of about +.5 with these numbers) it would be better to leave the calcium alone, drop the TA to 70 ppm, raise the CYA to 80 ppm (both of which are much more doable than lowering calcium) and then maintaining the ph at 7.8 wihich would, at the same temperature, give a SI of .01, essentially perfect for a plaster pool and would also help minimize pH rise in a salt pool.