Is the float not shutting off the water or is it not filling?

Absolutely. I have had one of these in use for over a year and it works flawlessly.

Yes

It works fine with my 50psi

My water pressure at my house is between 50-55 psi and work fine. Please note you have to have a pressure differential between you C02 tank and your incoming water pressure. The differential id about 15 psi and works perfectly on my system.

Hi Greg -- I've been using this lid for about a year and a half. I use a pressure reducing valve on my whole house se around 45PSI. Before I installed the PRV my native pressure was probably around 80PSI. Also no problems with this lid. I see the instructions here suggest running the water pressure higher than the CO2 pressure by about 10-15PSI. I believe my water and CO2 pressures are roughly the same right now. I have check valves on both the water and the CO2 lines. As far as I can tell I don't get any "fighting" between the two as they come into the keg or out to the tap. It's a great device and I think you'll be fine.

The post sticks up just under 1 3/4 inches from the top surface of the lid. On my 5 gallon Firestone keg the top of the post sticks up 0.4 inches beyond the handles

I had to use a converted pin lock keg to make mine work since mine had an integrated check valve ball lock. Do you want to know the height of the pin lock?

Very unlikely. You would not have enough water pressure (30-50psi required). However you could put in a inline carbon filter to remove chlorine and chloramines.

The only problem would be the pressure- my understanding is that an RO system will drop 30-40% of the pressure of the source. For seltzer you need the water pressure going into the keg to be higher than the CO2 pressure or else the water won’t flow in. So - if your home water pressure is like 40 psi and then the RO drops it to 25 psi then you will have to set your CO2 pressure to like 15-20psi which won’t make very intense seltzer. I’m using the Waterdrop 15UC-UF filter and it tastes great. I mounted the filter in the fridge to get some pre-chilling of the water.

I don't have an RO system in my Brewery but I can't imagine why it wouldn't work.

Doesnt RO drop your output pressurea lot? So long as the output pressure of your RO is higher than your carbonation psi this will work fine.

I think it really depends on how much soda water you need in the moment and how much water your RO system can produce. If you’re just filling up a couple glasses at a time I don’t see why it wouldn’t work. Filling up the keg the first time might be a little tricky because you need 5 gallons of water but if you buy a few jugs of distilled you could avoid the hassle.

Yes assuming your RO system output pressure is 10-20 psi greater than what your CO2 psi is set to. Otherwise it’ll struggle to fill the keg. My main water line (no RO) is 60 psi while my CO2 is 40 psi (strong “bite” lots of bubbles).

I use mine with a reverse osmosis device. It's important however that your RO system has sufficient pressure or at least more pressure than the psi you intend to carbonate your water. In my system the RO pressure is around 60psi so the max I can carbonate the water to is around 50psi.

Yep! We've got that set up right now.

I let it set over night to get the water cold - about 34 degrees. Works great.

It takes about a day for me. Make sure you let out the air in the keg so that it's only CO2 or it will never get very bubbly.

This is not an absorption type of carbonator. So if you fill the keg with water and then pressurize the keg and keep it at 36 degrees it will take a while to carbonate the same as if you just had a regular lid. Of course shaking the tank would provide for almost instant results. To get the full benefit of the continuous carbonator lid on the initial fill you need to purge the tank several times with CO2 no water yet then set the CO2 pressure to about 15 psi. Then attach the water line minimum water pressure of about 45psi. Cold water I use another prechilled tank which I pressurize the carbonator tank will start to fill and by the end of the process I increase the carbonator tank pressure to 35 psi. As your prechilled water supply is depleted I have another tank of water cooling to hook up to the carbonator. With this method I have very good carbonation as the continuous carbonator lid only allows in water greater than the CO2 pressure only until the float is satisfied and stops the flow. The initial purge process only has to be done the first time or anytime you choose to empty the carbonator tank. The water pressure has to be greater than the CO2 pressure so if you had a supply that was at least 45psi. (For a 35psi CO2) and you had the means to prechill the water line to 36 degrees the secondary tank business I spoke about would not be necessary.

I'm also using a 3-gal keg. I find that it's drinkable after 12 hours and fully carbonated after 36 hours.

Generally a carbonated keg takes 3-5 days to reach equilibrium. You should notice some carbonation in about a day. As it gets used and more water sprays through the pressured CO2 keeping high carbonation will not require as much time. If you shake/jostle the keg for 5-10 minutes you can seriously speed up the process as well.

If you are really impatient you can shake/roll the keg to help the C02 get absorbed

Probably about 24 hours. Btw I keep mine around 27 psi. Obviously personal preference but you might want to dial it back a little after you get the initial tank carbed.

The lid is supposed to infuse the water with CO2 as it fills. Otherwise treat it as a non carb lid (shake when cold).

2-3 days - you can speed this up by shaking/agitating periodically. And make the water as cold as possible - like 34F.

I left mine alone for about 18 hours at about 40 PSI and it was really fizzy. One thing you might want to try if you aren’t already is to vent the lid with the CO2 turned off until water comes out. I also put in a one-way valve on the gas line just in case.

Honestly I didn’t touch it but guessing it controls the level of spray from the spray jet.

I split the cold line to my washing machine and used this (standard male hose fitting). No fuss. Google this: female-garden-hose-adapter-5-16-push-in-x-3-4-nh-flat-inside*

1/4"OD Push Fit Angle Stop Adapter Valve... From there use the duo100 to convert to 8mm. Working well so far.