one quart treats a 120g tank. to bring 1.0ppm phosphate or silicate down to 0.05ppm. so the amount to use would depend on your phosphate readings and size tank.
if I recall you have a 55g, I would just use the whole quart becase you probably have more than 1.0 ppm phosphate or at least you have a lot of available phosphates from the algae problem your talking about in your other thread.
Rinse with fresh water before use (preferably reverse osmosis or de-ionized water). WARNING: Product may get hot the first time it becomes wet! Use rubber gloves and place in a plastic container while rinsing! Then place in a large mesh bag (800 micron) or a canister filter, directly in the water flow. Make sure water flows through the material and not just around it. Leave in water flow for 8 hours to 2 days and remove. If left in for more than two days, product will have reached the maximum phosphate adsorption and could begin re-releasing phosphates back into the system. To keep phosphate levels low, replace KENT Marine Phosphate Sponge on a regular basis.
For silicate removal, phosphates must be removed first. To do this, continually replace KENT Marine Phosphate Sponge on a regular basis.
Directions for Renewal
For phosphate removal, product may be renewed twice and adsorption capacity will be greatly reduced each time. To renew, spread ¼” thick on baking pan. Place in a 450°F oven for one hour. Let cool. Rinse with fresh water and re-use. Do not use pan for food.
Can also be used to absorb moisture when drying air for ozone. For this application, KENT Marine Phosphate Sponge can be renewed over and over.
