Great product, super easy to set up and works perfect.

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This has been running for a month now and it’s been wonderful! I was hesitant after reading reviews about purchasing it but I am happy I did. I will update this review if anything does go wrong, so far so good.

I have been using this for almost a year and it has worked flawlessly. I did have a problem with the first one I received when the solenoid coil failed on second day of use. I contacted the seller and they immediately sent me a replacement coil which was a simple job to replace. I have had no problems since.

I purchased this in combination with the Milwaukee MC122 pH controller to help automate my planted aquarium tank. This regulator is a precision made piece of equipment, beautifully designed and easy to setup with a standard CO2 cylinder and the controller, I inject the CO2 into a diffuser in my outflow line to the aquarium tank on a Cascade 1000 Canister Filter, all purchased through Amazon.ca.

I hope this reviews saves some of you from my fate. My Son recently started a planted aquarium and we purchased this regulator due the features for the price (solenoid, bubble counter, etc.). From day one this regulator had issues. The needle valve is very difficult to adjust and it doesn’t hold a consistent bubble count.After a couple of weeks I came home to find all my fish dead. I called Milwaukee. They told me I had back pressure in the line which probably caused the issue. It was brand new set-up with brand new CO2 tubing and a new check valve. They suggested I eliminate the check valve and check the tubing. I removed the check valve and replaced the tubing with a different brand. Another few weeks passed with similar inconsistent bubble counts. Then one night the CO2 started pouring in the tank again, it was like the valve was wide open. I quickly shut it off at the tank and did a 50% water change. Most of the new fish survived.I called Milwaukee the next day. Now they said I probably had a dirty needle valve and sent me instructions on how to drill this out. Yes, drill a hole in a less than 5 week old regulator. I again did what they suggested. Again the results did not improve.After another week of inconsistent and dangerous fluctuations, I disconnected the CO2 feed from my tank and ran just a new CO2 tube into a 2L bottle filled with water. Even with that basic set up the unit wasn’t consistent.I called Milwaukee again to let them know I wanted a new regulator sent out (I was still within the 3 month warranty). First, they told me “regulators are very simple devices and it’s your set-up that is the problem”. They kept telling me I had back pressure and/or a dirty needle valve and that any regulator I connect would have the same issues. Anything but admit that they may have actually produced a bad unit. They reluctantly agreed to swap out my unit but told me I needed to pay to ship the unit back. I said “that doesn’t seem like a great policy to me”. Their response “it is and you don’t know this industry”. He was correct. They also said I needed to send the defective unit back before they could ship the new one. I didn’t want my plants without CO2 for such a long period so I said I suggested I purchase a new one and they can just credit me back when they receive the defective unit. Their response “accounting doesn’t like us to do that”. Good customer focus. I was silent. The representative put me on hold for a couple of minutes and then came back and said “ok, this is what we are going to do”. “We are going to take a credit card number from you but won’t charge your card unless we don’t receive the other unit back”. Ok, I said, reasonable. Then it got odd. The rep went on to say “You need to get the unit in the mail today and we will mail you out a new one today”. It was 2pm and I certainly wasn’t about to drop everything to return a $100 regulator. I said, “I’ll get the regulator in the mail shortly but it won’t be today”. Then the rep said “I don’t think you understand how this needs to work”. He was wrong. I told him I would go through my credit card to void the charge and said goodbye.I ordered a new regulator that same day. As a final gift from Milwaukee, the regulator gassed my fish again the following day. I disconnected it and returned the Milwaukee regulator to the Amazon merchant I had bought it from. I bought a different regulator for more than double the price. Works like a charm from day one with the same set-up that I had been using with the Milwaukee. I set the bubble count and it has stayed consistent ever since. Truly set and forget. What a difference.As an advanced SCUBA diver I should know better than to skimp on a regulator. The money you save you will more than pay for in dead fish and frustration. The MA957 is junk and the customer service from Milwaukee is laughable.Avoid, avoid, avoid.

The Milwaukee version of this instrument is quite the deal considering everything else in serious CO2 land is 150 and up. I can tell it's constructed solidly - it's a little piece of craftsmanship. The instructions are printed on the outside of the product's box. There is a six month warranty, they say in a note inside the box, due to the corrosive nature of CO2. I have been running it for a couple weeks now and it seems mostly fine. It keeps a solid bubble count once I get it adjusted. It's relatively easy to use. (If you're new to this hobby like me, you also need a diffuser, a tank of CO2 from a local distributor, teflon tape, and some air tubing.) I do find that, like other reviewers, the exact bubble count can be tricky to zero in. When the timer kicks this puppy on in the morning, a lot of bubbles shoot through at once, which I would expect, but then, as the gas flow evens out again, it almost never goes back to the exact bubble count I had the night before. So far at least. Maybe I will figure this out eventually. That problem, and the fact that there is not a separate instruction booklet, is why I give this product 4 starts instead of 5. We'll see how long it lasts.Still working as of 10/13.

I just started using a CO2 injection setup in my planted aquarium. This one is complete and ready to hook up to a cylinder. the instructions are printed on the box and are very easy to follow. One note, don't make the same mistake I did, make sure the bubble counter has been consistent for at least 24 hours before you put fish in the aquarium, I didn't, I made an adjustment on the main knob then I left for work, When I came home from work, all my fish were floating and the bubble counter was spewing CO2 and had splashed out all the water in the chamber!!! All the fish and shrimp died except my male Betta, he could breath on the surface. Also make sure you have a CO2 indicator in your tank. I use the Red Sea indicator, it's fast and accurate and cheap! Hope this helps.