It looks like that product may well be cheaper. I seem to remember the prices being higher in the past; am I mistaken about that?

I looked up some of your posts on that product. You note that it produced severe cloudiness, which is what happened to me, when I tested one of the first products nearly 20 years ago. Does using the clarifier simultaneously prevent that? The product I used years ago also plugged the sand filter, and I had a hard time backwashing and clearing it. Did you notice any similar effects.

I'm not sure why, but the Kem-Tek product produced no cloudiness when I used it. I even tried pouring it in a column in the deep end, so I could see the cloudiness better, and never did. I did not notice any effect on the filter or pressure. On a 200,000 gallon pool, it took a total of 26 quarts to read PO4 > 125 ppb. The largest single dose I added was 8 quarts.