Response to Hi, Richard. In order to get this product to fix a suction leak, you must reverse the flow of water, to force the material through the leak under pressure. Preferably 5-10 psi. until the leak has stopped. That is because in most cases suction lines only leak water when the filter pump is shut off. Normal circulation will simply draw FIX-A-LEAK away from the leak and if the pump is shut off the material will simply not get to the leak.

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