I have a pool with a very complex shape (hopper style) and received very detailed instructions on using the TA test and precisely adding baking soda (Sodium bicarbonate) to raise TA or acid to lower it and using the new TA (total alkalinity) achieved to back figure the pool volume but I don't understand how this can work. I appreciate the instructions but something must be missing since no specific starting PH or TA is required. The tests do suggest running the pump at least 3 hours after addition but in my experience depending upon the PH or TA of the water initially one impacts the other. In my case acid demand seems high and its impact on TA seems lower than expected. It would seem using an addition of calcium chloride and measuring the increase in calcium hardness would be immune to such interaction and a better test for measuring pool volume so I hope someone will explain this to me.
But recently I did have far less increase in CH after adding over 40 pounds of calcium chloride so I would appreciate instruction on what I may have done wrong. I dumped it directly into the pool and brushed away any flakes that reached the bottom. It appeared to have totally dissolved. I did not back flush the filter for 5 days but I did run my Dolphin pool cleaner. I now wonder if the vacuum bag of my Dolphin cleaner could possibly have collected un-dissolved calcium chloride I could not see but as soluble as it is supposed to be I would have thought the massive amount of water moving through the bag would have finished dissolving any it might have picked up.
I did do this during a SLAM with elevated chlorine if that can have any impact. Thanks
But recently I did have far less increase in CH after adding over 40 pounds of calcium chloride so I would appreciate instruction on what I may have done wrong. I dumped it directly into the pool and brushed away any flakes that reached the bottom. It appeared to have totally dissolved. I did not back flush the filter for 5 days but I did run my Dolphin pool cleaner. I now wonder if the vacuum bag of my Dolphin cleaner could possibly have collected un-dissolved calcium chloride I could not see but as soluble as it is supposed to be I would have thought the massive amount of water moving through the bag would have finished dissolving any it might have picked up.
I did do this during a SLAM with elevated chlorine if that can have any impact. Thanks