Ultralife Liquid Phosphate Remover & Control safely and effectively removes phosphate (P04) from your aquarium, Simply add, 25 ml for each 8 gallons of aquarium water to remove 1 ppm, It is recommended not to remove more than 1 ppm in a 24 hour period, To avoid tank cloudiness, add to a skimmer or mechanical filter intake, 4 oz, SKU: RYLHC6478