It is a non-metallic algicide suitable for use in a chlorine pool to reduce the risk of algae forming. Many members here use it as added insurance during their closing.
Yeah...and all those baqua quats is why I'm not able to get an accurate biguanide reading using the Taylor K-1725 kit. Had to get a kit by LaMotte which seems to be far less affected by color titration issues.
Been doing it for years. I dissolve the granular pH chemical in a bucket of water, pull the cover back about 1/4 of the way, dump it in and agitate the water around for 10-15 minutes with a kayak paddle. One of these years I'm actually going to use the paddle with the kayak.
Does not make it safe to do. You are welcome to whatever you wish with your pool.
Why? If the chemical is fully dissolved, what danger does it pose to the water or plaster? I can see if somebody dumps in granular stuff that sits on the bottom (or falls out of solution). Taking a pH measurement following the addition does adjust as desired. Of course, I can't guarantee that I'd get the same result were I to take a sample from the shallow (still covered) portion, but...I feel peace of mind for getting the SI back in a safer non-etching or non-scaling zone.
The member I was responding to has a liner pool.
Makes sense. My builder actually is the one who suggested it back when he renovated in '14. Prior to that, I never checked any chemical levels during the off-season. But then the plaster on the bottom of the pool, prior to renovating, started to increasingly resemble a coral reef moreso than a swimming pool, so it was all good. Kinda like a car that's already pretty dinged up...a few more doesn't make much difference.
I understand the stance but with the funnel and semi-rigid tubing, the liquid chlorine is jettisoned into the pool several feet away from the liner and in liquid form it is dispersed fairly quickly & doesn't settle like a solid or powder. I move the hose to different quadrants of the pool, running about 1/2 gallon in each corner section.