Equipment - auto top off

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auto top off

Printed From: Utah Reefs
Category: Specialized Discussion
Forum Name: Equipment
Forum Description: This is the place to ask question about reef equipment.
URL: http://www.utahreefs.com/forum/forum_posts.asp?TID=46088
Printed Date: October 12 2025 at 4:17pm
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Topic: auto top off

Posted By: jmw
Subject: auto top off
Date Posted: January 16 2011 at 5:26pm

Has anyone used the Tunze 3155 Osmolator Universal (Auto Top Off) unit? If so what are your opinions on it?

Replies:

Posted By: P.Kapp
Date Posted: January 17 2011 at 3:13pm

I have one. So far, so good. I like the alarm it has that goes off when the water gets too full. its only happened when i unplugged my pumps to do some maintainence, but its loud enough to probably wake me up if something really bad happened... The magnet that holds the float and sensor is nice too. Makes adjusting easy

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Preston Kapp

210 Gal Reef

Posted By: kellerexpress
Date Posted: January 17 2011 at 4:42pm

I am using one from autotopoff.com. Its been very reliable and doesnt break the bank. I have heard the tunze one is sweet, I just cant get myself to spend that much money on one.

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IM 30L
Kessil A160we x2

Posted By: jmw
Date Posted: January 17 2011 at 5:53pm

I'm still a little confused about ato's. I keep reading where, if I understand this correctly, you have to keep the RO water elevated above the tank water level to prevent backflow. Is this correct?

Posted By: Luckedout
Date Posted: January 17 2011 at 6:46pm

No, back flow isn't the issue. Well I guess that could happen if the end of your tubing was actually in the water of your sump.

If the tubing where your ato comes out is below the water line of your ato then you can create a siphon and end up with more water than is necessary in your sump. Kinda like when you use a one of those vacuum hoses to clean the sand in your tank. So you just want to make sure that your ato water line is below the end of your tubing. Mine comes up a bit high so I just had to cut the tubing shorter than I would've liked and it splashes a bit when it comes on but that's better than lugging water.

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-Ben

90g Mixed reef

www.body-balancechiropractic.com

Posted By: jmw
Date Posted: January 17 2011 at 7:09pm

Thats good to hear. I don't have a sump so I will be filling directly into the tank.

Posted By: P.Kapp
Date Posted: January 17 2011 at 7:15pm

I have my RO tank directly underneath my tank in my crawl space. I just have the tube up out of the water and sitting right next to the glass so it doesnt splash when it turns on

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Preston Kapp

210 Gal Reef

Posted By: jmw
Date Posted: January 17 2011 at 7:25pm

That's it. I'm buying one!!!! Thanks for everyones input.

John