LF Opinions on ATO Units
 

I have had my tunze ATO for 4 years and not had a problem, knock on wood, I have a spare pump just in case.

I’m kicking myself as I was going to go with the Tunze but jumped on the Neptune wagon... sigh. If I’m putting that money out again I think it will be the Tunze, don’t need anything fancy and my primary goal is reliability.

I've used the JBJ for 7 years now, you can add whatever pump you want to the system and I did change the pump once, and just last week one of the float switches packed it in but a 7 year run I would say is pretty good in this business

Cheap too

I had trouble with my ATK as well. Worked fine for 6 months then would constantly fill. The problem was the high and low sensors were in the wrong spots. I have the steps they use for troubleshooting errors. Let me know if you would be interested in it.


I am using the Tunze osmolator 3155 right now. Only been using it for a couple weeks, but it seems to work well so far. It is much quieter than the ATK when pumping water I have found.

Are you up for DIY job?

A couple float switches can be found on ali express and wired into a Neptune Breakout box (you can DIY that too!) along with a 24 volt solenoid (again, aliexpress) tied into the 24v port of the Apex for a rock solid ATO. I'm doing the exact thing - total cost in was $22 including building the breakout box. External links not allowed here but if you PM me I can send you a parts list.

I've been using 3155s for over 7 years without issue. I've only ever had issues with 1 unit and the controller was swapped for a new one @ the place of purchase. Unit would freak out, even plugged into a surge protection circuit.
Replaced and problem went away.

I have 3 of these units and all are reliable as all get out. I keep a spare or 2 pumps around just in case. I got 5 years from a pump before deciding to replace it due to some noise, but it kept working right up until it was replaced.

In 7 years on 3 units I've only replaced 1 pump so far.

I do NOT use Kalk in my ATO - only RO, and never let my pumps run dry.

I installed a relay circuit to protect my pumps becoming dry.
Interested? Look HERE

Leaning toward the Tunze 3155 now! I bought 2 new sensors for the Neptune ATK and swapped out the old ones. Unit worked for 3 days and now doesn’t pump at all. Waste of money IMO... reliability and simplicity is all I need. Working shift work, often working later than expected, I need to know my return section has water.

Thanks for the feedback folks. Lots out on the market but like I said, longevity and reliability are my key. :smile:

I use the Innovative Marine Ti Ato set up. Been bullet proof for me.
I like the magnetic dual low voltage sensors.
Basically a high/low setting.
You can use any pump as well but I opted for the matching IM Ti pump.