Karty,
Where does one buy that calcium h stuff ?
Swimming-pool section of stores like WalMart and swimming-pool speciality stores.
Pool Supply stores are the best. Make sure it’s pure and as high a chlorine continent that’s available.
I from this on line I am sure there are others:
Pinch a penny n wmart have low percentages. i found a local place here in winter haven fla called village pool. theirs is 78%. Its 3.99 a bag.