I put my GFO in the reactor and then put in on the side of a bucket with the feed pump in the bucket and the output down the drain. I then turn on the pump to a slow setting and then turn the tap on to fill the bucket as the water that was in the bucket goes thru the reactor and down the drain. I wait until it runs clear and then increase the flow to where I want it and then wait for it to run clear again. Then I put it on the tank.
I tested my tap water for phosphates and it came up very low (0.01) so I am not to concerned about it effecting the efficiency of the GFO.
For carbon I do the same thing but turn it on high from the beginning and only let it run for a minute.
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