LaMotte Phosponate Test Kit, Direct Reading Titrator, 0–20 ppm/4 ppm HEDP/PBTC, 50 Tests
There were some posts way back when that indicated some concerns about clouding due to a "small overdose of the most popular stain and scale control chemical ingredient, HEDP".
You can read them here:
hedp-overdose-and-clouding-t12982.html
I still have some cloudiness after raising my CH from 150 to 300, then doing a citric acid cleaning and subsequently adding a lot of HEDP within one week (about 4 qts in 20K gals). The directions are 1 qt per 10,000 gals for first treatment, then 2-3 ozs per week maintenance, but the acid treat procedure implies that more is better than not enough.
Other than polyquat type algaecides, I don't what other pool chemical can't be tested adequately and economically. It's like flying blind.
There were some posts way back when that indicated some concerns about clouding due to a "small overdose of the most popular stain and scale control chemical ingredient, HEDP".
You can read them here:
hedp-overdose-and-clouding-t12982.html
I still have some cloudiness after raising my CH from 150 to 300, then doing a citric acid cleaning and subsequently adding a lot of HEDP within one week (about 4 qts in 20K gals). The directions are 1 qt per 10,000 gals for first treatment, then 2-3 ozs per week maintenance, but the acid treat procedure implies that more is better than not enough.
Other than polyquat type algaecides, I don't what other pool chemical can't be tested adequately and economically. It's like flying blind.