Very helpful. Thank you!!! I never even though about pouring the water back and forth.

So I guess it is supposed to turn literally red? I have a huge thing of calcium up. I bought it when I started the pool up for the first time last year and I've only ever used 1 scoop of it. My pool has really bad scaling and I read that can be caused by low calcium because calcium is pulled from the plaster. So should I add some? If so how much?



Another quick question... My PH was low so according to the pool calculator, which BTW I like so much that I bought the app today, so I added the suggestion amount of Borax. How long should I wait to retest ph? I ask because I went ahead and retested after about 2 hours and now the Ph is off the chart high. I'm hoping that is because I am just too impatient. :-)