No problems in my tank with the turface; zero ammonia; only thing I've noticed is the ph nose dived which I brought right back up with a little baking soda; Jeff Amman Amman Septic Designs, Inc. www.gotperk.com 360-794-7809 (Office) 425-501-5195 (Cell) 360-794-5408 (Fax) _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member