I just picked up a D-1 diatom filter today. After two hours'
operation, the bag is very green but the tank is not yet noticeably
less so. Patience, patience...

That's normal. Couple of things that help are to place the intake
and exhaust as far apart as possible even if you have to add a hose
to the output.

Make sure you're accurate emasuring diatom powder. Eyeball it
and be off by not that much and it'lll either not filter
properly or have dramatically reduced water flow.

Use the carbon. Makes the water even clearer than just the diatom
powder.

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