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My fancy digital timer with the ability to run 50 events settings (on/off cycles) per day. Right now running twice an hour on the hour and thirty min mark for 6 min each cycle. I can not make the cycle any longer because it would flood my grow beds. I realize this is only 12 min an hour and not the full recommended 15 min on 45 off, but it is 80 percent of that and I feel it will filter my water sufficiently.
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Comment by Chris Carr on August 17, 2012 at 11:41am
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15 Minutes is only a rule of thumb, not a concrete rule you must follow. If you can however, do not rely on the timer interval alone to protect your growbed(s) from overflowing. You should have an overflow drain plumbed to the bed just in case something bad happens. For example if you bed fills completely but doesn't drain completely or at all before the next fill, then 30 minutes later you'll have a mess to clean up :)
If you have an overflow plumbed, then you could set your interval time higher if you then wanted to. The excess will simply just overflow back to the sump/fish tank and once the pump stops, it will start draining. Regardless of hang time in the bio filter, you should shoot for passing the entire fish tank volume of water through the filter once per hour.
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