to flush i use spring water in a gallon jug ,, its 80 cents at the local store ,, it is a lil high on the PH scale ,, being in the hi 7's ,, so like always i add molasses while flushing ,, the molasses is acidic & will bring ph down to a good level.... i add about a shot glass of molasses per 1/2 gallon of water & it gets my PH at a nice 6.5