I HAVE A AQUAPURE FILTER.:dance: I STARTED IT IN MARCH 2010 MY NITRATES WERE AT 20 PPM. BY MAY DOWN TO 0-.25 NOW AT ZERO. IT WORKS WELL THE ONLY DOWN SIDE I SEE IS PH DROP TO 78-79 IN A WEEK. I BUFFER IT 1 OR 2 TIMES A WEEK. I WANT TO THE SANTA MONICA THREAD LOOKS LIKE THE SCRUBBER WILL RAISE...