The Planted Tank Forum - View Single Post - DIY Automated dosing/topoff
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post #5 of (permalink) Old 11-10-2004, 02:38 PM Thread Starter
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Join Date: Feb 2003
Location: San Juan Capistrano, CA
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Check valve sounds like a necessity, not for pressure, but for safety.
I was also thinking the check valve was needed to keep the fertilizer from being sucked out.
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