For the last few years I have been using EcoWater Solar Salt which lists itself as 99.7 % pure. I use the same salt in our softener and have noticed that there have been some contaminants or something in the salt that has left a dirty ring in the brinewell and filthy water when the salt has gotten really low. Supplier couldn't really explain other than maybe a bad bag of salt, (although it has happened on two separate occasions.)
Last year I had a real issue with some type of soil bacteria "eating" up my CYA and really struggled all summer with minimal satisfaction. I am wondering if it came via my salt.
Is there a recommendation on what kind of salt to use for the SWG? Pool store has some but it is really pricey.
Salt is getting low and I need to add some but am a little nervous as I've just gotten the pool cleared up.