When replacing carbon in tanks, there will be a lot of air caught in the minute cracks and holes in the granuals. It may take a few days for the carbon to become completely saturated. In the meanwhile, you will see air tiny air bubbles in the water...not to worry.
Some of the carbon may float so let it sit for a short time nd run water through it before backwashing it.
There are different grades, brands and quality of carbon.
Check your drain line and make sure it is clear and not pinched. Replace if you feel to it's needed. It is cheap and may prevent some problems.
Andy Christensen, CWS-II
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