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This is not a slow-dissolve or time-release product
Since it is an interconnected system
The concentration should be between 380 and 450 mg/l (ppm)
Use the Eshopps Float Valve as part of an automatic top-off system you create to replenish aquarium water lost through evaporation
A sensible starting point is with up to 2
Aquatop Forza 40-80 Replacement Filter Pads for PFE-9 Power Filter - 2 Pack CaribSea This is not a slow-dissolveAquatop Forza Replacement Filter Pads are made of strong poly fiber with premium activated carbon to collect organic debris for easy removal. Organic debris can reduce filter efficiency and cause the buildup of odor and unsightly sludge. These replacement pads come pre assembled for quick, easy installation and replacement. Fits PFE 9 power filter Removes organic debris from aquarium water Activated carbon helps maintain ammonia levels Directions: