View Full Version : ATO's

09-23-2010, 9:49 PM
Aquahub vs. osmolator vs JBJ. Opinions? Is the added expense worth it?

09-23-2010, 9:52 PM

Most Expensive

Middle of the Road

Is your tank totally DIY (Aquahub), or is it the Ferrari (Tunze, though I guess I should say Porsche since it's German) of tanks? They all work fine.

09-23-2010, 10:02 PM
No its not all diy... but I'm not the type to care if I can say I have the coolest thing. Or show it off. My concern is reliability. I don't want a flood or other issues. If the aquahub is just as good as the other 2 then y would I spend $150 more, unless I just have money to blow.

09-23-2010, 10:42 PM
I don't think anybody makes a fail-proof float switch. If there is one let me know.

09-24-2010, 12:19 AM
i thought the optical ones were supposed to be close

09-24-2010, 1:49 AM
They are pretty close to bulletproof, and they have a backup float just in case, if I remember right.

IMO the biggest things to keep in mind are:
Tunze will keep your water level the most constant, because the optical sensor does not have to let the water drop "X" amount before coming on... a float switch has a certain amount of "travel" from open to closed, and the Tunze does not.

JBJ is a good unit, BUT there is one scenario in which it will be trouble (and I know because it happened to me). If you have a pretty large sump, AND you use a "slow" pump like an Aqualifter (which I do because I run the ATO through a Kalk reactor), it may not be able to keep the sump full.

The reason is, it takes a few gallons at least to raise a float switch on a large-ish sump (where the return area has a pretty large capacity). A JBJ will "time out" after anywhere from a couple of minutes to fourteen minutes MAX. This is a safeguard against flooding. The time allowed is internally adjustable. In my case, with my pump, fourteen minutes' worth of water would not bring the level all the way up and the ATO would time out on me. It will not "reset" until the float switch rises and shuts off the pump. I would come home and find the sump low, the pump off and the JBJ showing that the sensor was low.

I ended up changing it out for a Reef Fanatic (with no timeout feature), and putting the JBJ on my wife's tank (which has a small sump). No issues at all since.

FWIW, I am buying a Tunze next. I like the consistency, and the alarms that it has for things like high sump water level.

09-27-2010, 4:00 PM
Another way to help prevent floods is to add a mechanical timer.

09-29-2010, 9:01 PM
so basically I should just buy the cheapest one because they are all the same?

09-29-2010, 9:06 PM love them, i have a 4 float switch 12v system. Love their stuff!

Ralph ATL
09-29-2010, 9:26 PM
I bought a gravity fed here

ato gravity fed ( t_Electric_Powered_Dosing_Pumps_Top_Off-Gap_Products-GA1111-FIDPET-vi.html)

I have it going through my back wall to my closet with a 5 gallon storage tank. Even if it totally fails, no real harm done.

09-29-2010, 9:54 PM love them, i have a 4 float switch 12v system. Love their stuff!

agreed, you cant beat the price and mine has worked perfectly for the last year without me touching it! check them out!