FZONE Aquarium ATO with Controller, QST2.0 Auto Top Off System for Saltwater Aquarium & Freshwater Aquarium

Perfect ATO System - Set It and Forget It! The FZONE Aquarium ATO with Controller has been one of the best upgrades I’ve made to my tank. Setup was incredibly straightforward, and the controller feels solid, accurate, and reliable. The optical sensor detects water levels perfectly, and the pump tops off smoothly without any noise or delay. I love that I no longer have to worry about daily evaporation and my water level stays stable, and my fish are happier than ever. The safety features give great peace of mind, and the build quality is way better than I expected for the price. If you’re looking for a dependable, hassle-free automatic top-off system, the FZONE ATO is absolutely worth it. 100% recommend!

So far I have been very impressed with this ATO. Operation is whisper quiet and the controller makes it easy to disable for water changes and the sensor is accurate. I can attest to it's ability to stop automatically if pump is active for too long after my sea hare went across the tank's overflow weir when I was not far away. I heard the alarm and checked to find the weir partially blocked and the return pump chamber low. Once the hare had moved on, I just pressed the button on the controller and it reset it self. On another note, when people complain about overflows, I wonder if the sensor just needs to be cleaned of salt/mineral buildup.

This seemed to be working fairly well until it went crazy and dumped 5 gallons of freshwater into my tank. That led to an overflow in the sump and I suddenly had a lake in my office. Fortunately the tank is new, so there were no corals or livestock in the tank. I will be going back to doing manual top offs. I recommend that you stay far away from this.

Great ATO! Have used Tunze products for years and decided to put this in my 20g AIO. The control unit came with a weird (dead) spot in the LED ring but still worked great. I contacted FZONE and they sent me a new unit the next day. Great customer service and a great product. Don't see why this won't last a long time as long as you clean the sensor periodically and don't dose Alk where the sensor is.

Excellent value for money, works extremely well and customer service is top notch when it comes to warranty and customer satisfaction. Very easy to set up and install in any tank. Most times I completely forget it’s in the background doing its thing .

I’ve been using the FZONE ATO with QST2.0 Controller for a few months, which has completely streamlined my tank maintenance routine. Right out of the box, I was impressed by the build quality — sturdy components, well-packaged, and clear instructions. Setup was a breeze. It took under 20 minutes to install and calibrate everything. The QST2.0 controller is the real star here. It’s smart, responsive, and offers a level of precision that gives me total peace of mind. The sensor is extremely accurate and doesn’t require constant tweaking like some cheaper models I’ve used in the past. I particularly appreciate the fail-safe features — if something goes wrong (like the reservoir running dry), the system alerts you and shuts off automatically to prevent any disasters. I’ve noticed a significant improvement in the stability of my tank's salinity and water levels since installing this ATO. It's super quiet during operation, and the included tubing and bracket are both high quality and easy to position just right. I had an issue months later with the sensor accuracy, contacted Customer Service and they replace the part immediately! Thanks Cheryl! If you're on the fence, don't hesitate — the FZONE is worth every penny. Highly recommend!

Low water faults a few times a week. Other than that it works well.

I travel and really don't trust anyone to keep up with my salter water aquarium and the reservoir to keep my auto top off full. I purchased this use in my backup reservoir in hopes of it keeping my main reservoir full at all times, for at least 6 days. It worked like a charm! I'm so glad I got this, and especially for the money! ! It's quiet, and simple to set up. If it is empty, the red light comes on to turn off the pump. When you're ready to fill it again, you just push the red button, and the pump turns back on. Easy!

Avendo in casa diverse vasche nel periodo estivo mi trovo a dover rabboccare l'acqua evaporata, se la vasca è piccola ci si sta dietro ma quando questa è grande diventa un vero problema. Per tale scopo ho acquistato questo sistema di rabbocco automatico, l'ho testato appena arrivato simulando una evaporazione minima e devo dire che dopo che l'acqua è scesa di pochi millimetri, il sistema ha attivato la pompa per ristabilire il corretto livello, ho ripetuto diverse volte questa prova e il sensore è sempre intervenuto in modo preciso. La pompa l'ho immersa in una tanica da 20 litri essendo piccola per mia fortuna è passata dal foro del tappo, la pompa riesce a spingere l'acqua tranquillamente nella vasca nonostante sia a livello pavimento. Nella confezione c'è tutto il necessario all'installazione, non manca proprio nulla, quindi che dire il prodotto è perfetto, completo e allo stesso tempo funziona bene. Dimenticavo lo utilizzo anche per i cambi settimanali d'acqua così non porto più su le taniche e fa tutto lui in automatico e la mia schiena ringrazia.

Great product with useful features. Easy to install and works very well. The low resovior water warning light is a great touch.

No funciona bien. Se suspende a cada relleno aún teniendo agua el depósito. Debes estar muy al pendiente a que no se suspenda (ponerse en rojo la luz), es lo mismo a estar rellenando en modo manual. Tendré que comprar otro que sea seguro en su funcionamiento.

Das Nachfüllsystem hat 6 Monate super funktioniert, bis ein Wackelkontakt im Sensor auftrat. Der Sensor wurde anstandslos ausgetauscht, auch der Support des Fzone Service hat sehr schnell geantwortet. Bin sehr zufrieden und kann das Produkt auf jeden Fall weiterempfehlen.

I ordered yesterday and received today. It was real fast. it is nicely packaged when I received it. All parts looks very neat and good quality. This is my second time using a Fzone ATO, base on my experience, they work well.