ESV AQUARIUM PRODUCTS CALCIUM HYDROXIDE (KALKWASSER POWDER) Size:3.5 LBS Three of the holes are

Three of the holes are for 0

the output can be doubled without the need for any additional waste water over a single membrane

Leave product in place for 4 days

besides providing good water quality and nutrition

The other benefit of moonlights is that it extends the time you can enjoy your aquarium and in a totally different way

ESV AQUARIUM PRODUCTS CALCIUM HYDROXIDE (KALKWASSER POWDER) Size:3.5 LBS Three of the holes areCalcium Hydroxide (Kalkwasser Powder) Calcium Hydroxide is a proven standard for maintaining calcium concentration and alkalinity in closed marine aquaria. The calcium provided is directly used by calcifying organisms, and the hydroxide ions provided readily convert dissolved CO2 into bicarbonate and carbonate ions, which are also directly used by calcifying organisms. Our product is extremely pure and meets American Water Works Association and Water