ATO diluting salinity

[daniella3d]

Something seem not right with your setup. I have 2 JBJ auto top off and never had a problem with any of them.

Why is the water level fluctuate in your sump???

Whenever I do water change or maintenance I turn my top off offline so that it does not continue to fill up fresh water.

Originally Posted by wmcinnes

On my 90 gallon system with herbie overflow I have been having issues where I cannot seem to match water coming down the drain with water going up into the display. The fluctuating water level in the return section of my sump is causing premature top off and is, therefore, diluting my salinity. Is there any solution to this?

Im running a JBJ Auto Top off system with a Aqualifter pump and my float switch is located in the return section.

Has anybody else had this problem? Any insight would be appreciated, thanks!

[tim the toolman]

Sounds like your overflow downpipe is not large enough to handle the volume your return pump is pushing.
How long has this been an issue?
Is it possible you have the ato control in the wrong section of your sump?

[toytech]

my durso overflow would do the same thing , i had 2 1 inch drains and a 500gph return and if i didnt tune the drains with air intake and choke valves they would pull full siphon and drain the overflow box then lose siphon and the return would pump the retun section way down . So you might just have to fiddle with it a bit.

[philg3]

Do you have a Gate Valve? The Herbie takes some fine adjusting to exactly match the full siphon flow rate to your return rate. Once dialed in it should be steady.

[mark]

even with a gate valve it's just slight adjustments to get flow balanced. Once that's sorted out shouldn't have to worry about your ATO

[philg3]

Originally Posted by mark

even with a gate valve it's just slight adjustments to get flow balanced. Once that's sorted out shouldn't have to worry about your ATO

I meant if he does not have a gate valve and only a ball valve it will be very hard to make those slight adjustments. The Gate Valve makes life infinitely easier to find the sweet spot compared to the 1/4 turn ball valves.

[gregzz4]

Wayne, I haven't setup my new Tunze ATO yet, but I remember reading in the manual that there is more than one way to set the on/off pump level by spacing the sensors further apart.
Have you checked your's to see if you can have the leeway you need?

[paddyob]

Originally Posted by daniella3d

Something seem not right with your setup. I have 2 JBJ auto top off and never had a problem with any of them.

Why is the water level fluctuate in your sump???

Whenever I do water change or maintenance I turn my top off offline so that it does not continue to fill up fresh water.

Agreed something is not set right.

Originally Posted by tim the toolman

Sounds like your overflow downpipe is not large enough to handle the volume your return pump is pushing.
How long has this been an issue?
Is it possible you have the ato control in the wrong section of your sump?

Should be irrelevant. Unless he is never stopping the ATO, the water would mix completely within a relatively short amount of time.

I would say maybe your salt level was wrong to begin with. Perhaps your refractometer needs calibration, or in the case of float style, maybe it's off by several points like mine was before I tossed it.