oh, and you can see from the pic of the GFO reactor that my GFO is all up near the top of the reactor. Since I started dosing MB7 I've been having problems with things clogging - the output line of my biopellet reactor, the sponges in my GFO reactor, etc... I've been having to empty the GFO reactor and rinse out the sponges really well every few days or they get so clogged the whole mass of material inside it rises to the top like a hydraulic piston. I don't think fresh water actually kills that biofilm though, so last time I did it I bleached the heck out of the sponges and so far it hasn't happened again.
I've cut way back on the amount of MB7 I'm dosing hoping this will stop happening.
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