battery backup air pump.

what do you think of this product? how long will this alone sustain a tank during a power outage? i don't mean battery run time, i mean how long can an average tank survive with just an air pump?

Azoo Non-Stop Air Pump with Battery Backup - AquaCave

anyone use this, or know of a cheaper alternative. i think this is a lot to pay for an air pump with batteries.

 

Yeah thats alot, I picked up some from walmart in the fishing not fish section, they are used to keep air in your boats bait or fish holding tanks. I also bought a 12v operated sump pump to use for water movement, Also in the fishing/boat section. I think I paid 3 or 4 bucks for the air pump and maybe 10 for the sump pump.

 

Silent-Air Auto/On Battery-Powered Aquarium Pump - at Hayneedle Shopping

what about this one. anyone know what size tank this would work for?

 

There are some at Marine Depot for about $10. http://www.marinedepot.com/air_pumps_hagen_battery_operated-ap.html They use the AC supply just to detect a power failure. They don't run on AC like the first one you posted. When the power fails they run on batteries.

You don't want an airstone running continuously in your tank due to the salt spray. So you want one that kicks on only when the power fails. My concern is that the airstone will get covered with coraline for the ear it is running before a power failure occurs. Then when the power failure occurs your airstone will be a piece of live rock and the air won't be able to get through. Maybe somebody that has used one of these could provide some input.

I'm still thinking a UPS connected to a low wattage powerhead is the best way to go.

 

i saw some of those for sale but they are battery only and did not come on automatically, so if you're not home they are only good if you are home when the power goes.

if i do go with a battery air pump it would be on like that, not only because of spray but also because of the price difference. i could by this one for $10 and a normal one for full time use and still spend a lot less. i wish i could say coralline would be a problem for me, but my tank is still new with hardly any. you could probably just unplug the unit weekly and let it run for a couple minutes to prevent it getting clogged.

the UPS would be my first choice, but they are very expensive here. i saw one online for $57 US. in stores here the price is around $700TT ( $112 US).
this a lot smaller then the one from the link u posted, so imagine the price of that one.

Amazon.com: APC Back-UPS ES 8 Outlet 550VA 120V: Electronics

i'm sure this unit would not run anywhere near as long as the other one u posted also.