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This type of slime growth on this RAIN4 waterfall scrubber in saltwater really needs the screen, tray, and pipe slot to be brushed clean every 3 or 4 days, and would do best with an optional Slime...

Here is an almost perfect growth ring, allowing full flow to the thicker inner parts of the screen:

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Ring !

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Growth Rings

The usefulness of "growth rings" (which are sometimes called bald spots) was not fully understood until recently, and in the past were avoided. But it turns out they can be a...