Customer's DROP1.4 scrubber in saltwater. Note the LEDs are strong enough to penetrate through the growth, so they never get grown over. Also note the strings help fill in the middle section with growth. And lastly note that there is more than enough water circulation inside; the small holes on the bottom of the scrubber is all that is needed or wanted (any bigger, and snails would get inside).
When this fills in more, you would harvest (clean) by reaching in and pulling out the growth. For freshwater cleaning on DROP's without strings (like the 1.2 or 1.2x) the growth is too slimy to grab so you take to your sink for a brushing (or open it and let the fish and snails eat!)...
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