Love It!!! By Troy on 3/2/13

Troy would recommend this product to a friend

You get what you pay for, and this ATO is awesome!!! Easy to setup and fail safe. Great quality.

Serious about reefing? Get this! By Chris on 2/28/13

Chris would recommend this product to a friend

One of the smartest purchases I've made. Expensive but made with quality and plenty of mounting options. Highly recommend!

Worth the Investment By JOHN on 2/24/13

JOHN would recommend this product to a friend

I was a little apprehensive about spending this kind of money on an ATO. From the moment I opened the box I recognized the quality. Works perfect, provides piece of mind, and everything you need is included. Previously bought JBJ but was disappointed due to lack of redundancy. This should be fail proof with dual sensor/float valve.

Tunze ATO By Toby Flenderson on 2/23/13

Toby Flenderson would recommend this product to a friend

Pros: works perfectly, precisely, the German way.
Cons: hard to fight off all the ladies who want to get there hands on my tunze.

best topoff out there By chris on 2/18/13

chris would recommend this product to a friend

This topoff is the best there is. I replaced my jbj with this and am so glad I did. The optical sensor with a float is pretty much fail safe and my water level stays the same.

Love it! By Joe on 2/13/13

Joe would recommend this product to a friend

I've never had an ATO system, but this unit is awesome! I had no problems setting it up. Sure, the instructions MIGHT be lacking a little, but I don't feel the complaints below are justified.

The main sensor monitors the water level and activates the pump. The other one can be used as a safety shutoff/alarm OR as an alert that your ATO reservoir is empty.

It's your choice!! I, personally, set it up in the latter form and the product works great.

Terrible By Pissedreefer on 2/1/13

Pissedreefer wouldn't recommend this product to a friend

This product sucks end of story

Perfect! By Calvin on 1/15/13

Calvin would recommend this product to a friend

after lugging around water for a few months i decided to get this along with a large storage container to relieve myself of water duties every morning. works great ! only have to top off the container once a week !

Once it's going it's great! By Terrie on 1/11/13

Terrie would recommend this product to a friend

I have to come back and review again only b/c I gave it a 3 getting frustrated with the set up. The instructions are more for someone familiar with ATO's..not me.. this is my very 1st one. I finally found a forum 3reef that someone had posted full details with pics and was able to get mine going. Had I had any knowledge at all about what I was doing this would have been a 5 minute setup! Now I know, it's done, wow it's simple!!

It is not even letting and 1/8 of the water out before it tops it off... This I like!!! I pray for longevity for this price :)

??? By Terrie on 1/10/13

Terrie would recommend this product to a friend

I have to say I can't even give this item a rating yet. I received it a couple days ago and looked at it, put it back in the box and read the instructions. I took it out again and my head is spinning. Again today I took it out and my head is spinning. I'm trying to see the dark picture examples, I've read and read the instructions 10 times. For someone who has NEVER had an ATO of any type I chose this b/c of the good ratings and being BRS recommended. I figured I'd just spend the $ the first time instead of being someone who went less inexpensive and regretted it. However, like I said I've NEVER had an ATO of any type.... THIS THING NEEDS REAL INSTRUCTIONS FOR INSTALLATION!! I don't know what the parts are called so reading the long drawn out instructions isn't helping, the pics are too dark, and I can't find anything on the web!

Frustrated!

Great until it failed By Guy on 1/8/13

Guy wouldn't recommend this product to a friend

My Tunze 3155 is almost 4 yrs old, but just recently failed. After a short while it stops working and the TOO HIGH led is on while the TOO LOW led is flashing. I have to cycle power to reset it but it faults again shortly after the reset, no matter if the water level is good ( green led on) or low. I communicated with Tunze and the controller needs to be replaced. I find it difficult to have to pay for a complete controller unit (including sesors) just to replace the controller. Very expensive, almost the price of a new 3155. Plus I find this is not a rare occurance - easy to find others with same issue on the web. A super nice unit when it works, just too expensive to my taste.

COULD NOT LIVE WITHOUT IT!!! By Sherri on 1/8/13

Sherri would recommend this product to a friend

I have never owned an ATO, but this has to be one of the best. I have no complaints whatsoever. I would recommend to everyone who runs saltwater tanks. Worth every penny and would repurchase again if needed.