Looking at Auto Top Off equipment, what performs as advertised.

[ShellSea]

Avast marine with the backup float valve is all I use now.

Plus One on Avast Marine. I just installed mine after trying and shelving two others Hydor and AquaMedic

 

[dsh92056]

I haven't tried all the different ATO's just Tunze and Neptune ATK. I had nothing but problems with Neptune's (could have been operator error.) I use Tunze on both my tanks with zero problems going on 5 years.

 

[Flippers4pups]

I'll second autotopoff.com for ATO control. Been using the redundant electronic float switch for years and years. Rock soild.

 

[Sonor]

I use the Tunze ATO over 7 years now 24 gallon and 200 gallon reef and 100 FW, I don't think you can beat them.

 

[Daniel@R2R]

Tunze Osmolator is the base standard for ATO's (and the Osmolator Nano which is this unit's little brother). Fun fact is that Tunze actually invented the ATO. I have an Apex, so I use their ATK, and I love it! I can recommend either of those options.

 

[lbacha]

Tunze Osmolator is the base standard for ATO's (and the Osmolator Nano which is this unit's little brother). Fun fact is that Tunze actually invented the ATO. I have an Apex, so I use their ATK, and I love it! I can recommend either of those options.

Have you used both then? I have a tunze and really like it but my system is also automated via Neptune so the info their atk would provide would be nice. I didn’t go with the atk originally since it was new but now that its been out for a while have you seen any reason not to switch

I need a second ato for a non Neptune monitored system so I have to make the purchase anyways and I would just put the tunze there

 

[JDnKY]

This is what I use and my brother and buddies use we have never had a problem ever. Mines been up and running for 3 yrs I have it installed in a 29 gal biocube. It pumps about four foot from my reservoir to display.

I also us AutoAqua but have the AWC. I used is as an ATO only for the first 6 months and it pulls from the bottom of a large Brute can on the floor to the sump sitting on an old kitchen table beside it. Works great. Hooked up the auto water change pumps a couple of m0nths ago and now water changes are as easy as mixing water and touching the screen. It was about $200 and worth every penny.

 

[MarineMalecki]

+1 on the Tunze 3155.....used mine for several years and it worked well.....the only 2 issues I had were minor:
1) I used kalk in my ATO, so periodically I'd have to soak the pump and tubing in vinegar to dissolve the kalk buildup
2) The pump that was included wasn't self-priming, so every time I'd refill my ATO water container, I'd have to re-prime the pump. Not the end of the world, and not a problem with the operation of the system, but just something to be aware of.

I switched to the Hydor ATO on my new system (600g) since I wanted a larger pump to top off the ~10-20g of evaporation each day. That system has worked very reliably as well for the past 2 years.

 

[Dragon52]

I use a Trigger 5gl ATO tank & This, in 2 yrs the only issue has been plugging them up wrong. Lasts me a wk depending on return flow to the tank I set.
https://www.marinedepot.com/Marine_...Off_Units-Marine_Depot-MD88503-FIDPAT-vi.html

 

[mattzang]

xp aqua duetto working great for.. 2 whole months!