During the process actually backwashed a total of 4 times that produced what looked like rust. Pool was improving then turned dense green. Did not think algae with the high FC and polquat. Did notice a pH drop day after using polyquat-just brought it back up with cal-hypo. Today
pH 7.6
FC 14
Still green, maybe a little less dense. Placed a Culator in trap in case residual Fe.