Gravity fed fluidized bed filter

Love the idea of fluidized bed filters heard they can process lots of waste depending on the sand they can buffer ph and face it they look cool

My question is...

I want to use a gravity fed one on my tank now how would I go about doing water changes when the water stops flowing for that hour or so? Do I add a air pump and bubbler wand turn that on when the water stops? I know if it's shut down for a while the sand compacts bacteria dies and can start a re cycle so any tips?


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Why would the sand fall out? And yes straight from my overflow down to my filter and I could use a bubbler but also don't want the added electric bill lol


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http://m.youtube.com/watch?v=e5u9oW-PSy0



Something like this, in my sump water comes from tank down to the fbf then into the rest of sump filled with heaters and what ever

But will the whole thing seize up if shut off for an hour or so


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Soo.. How to keep it from seizing up?


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Why do you say it uses an air pump?

And when I do water changes I turn off my return pump, drain water, fill water, turn on pump so for about an hour there is no flow of water


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http://m.youtube.com/watch?v=oYczMcW9V-o


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