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Old 03/08/2018, 10:37 PM   #9960
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Join Date: Feb 2007
Location: Santa Monica, California, USA
Posts: 2,485
Depends what you mean by spray. New waterfalls sometimes spray/push water to the end of the slot until they fill in with growth.

Inventor of the easy-to-DIY upflow scrubber, and also the waterfall scrubber that everyone loves to build:
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