The Planted Tank Forum - View Single Post - how many 2 liter bottles?
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post #2 of (permalink) Old 01-29-2013, 01:21 AM
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Join Date: Dec 2010
Location: Houston, Texas
Posts: 680
I used 3 of them on my 29 which was pretty heavily planted. I tied them all together using a check valve on each one so that you don't lose pressure in the whole line when you disconnect one to swap out. I changed one bottle every weekend in rotation. For me they seemed to produce for about 3 weeks, so that's how I ended up with that rotation.
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