I have a very high air-pressure setting, so a lot of air is moving through and when it's dry, the problem is pretty extreme. So the humidity has to be set on maximum, and that means the tank was running down very quickly and never making it through even a few hours. I don't think there is any other approach to the problem that can work like the C-Spring. I know there is at least one separate humidifier system but why? Why try to connect another tank that's not much larger? Or maybe run two at once struggling to calibrate the moisture, and then needing an additional powered heated tube because the humidifier I'm speaking of can't take a heated tube, which is needed to maintain a high enough dew point in the tube or the water will condense on the tube walls from being cooled by the air in the room? The C-Spring ends the problem at the source: you have your own tank in your device do what it normally does but now it never runs out of water during the night. And because it maintains the same half-full state of the CPAP/BiPAP tank it's always putting out the same level of humidity (when the tank is full it responds to the heat from the metal plate differently than when it's nearing empty). This is an upgrade that feels like it should be part of the system from the beginning.
The pump is surprising and wonderful - it does the fill in an instant and stops, like it's magic. The sensors are very clever - they measure the electrical capacitance of the water and the air so it knows perfectly what the water level is without having to get wet, right through the wall of the water reservoir. Kind of amazing that such sensors exist and very nice that they're part of this system. When I tilt the tank to check that everything is working (the recommended method) the fill is silent and immediate, not in spurts, no sense of something struggling, no whine or chunk-chunk of a pump. Just instantly up to the proper level. So far, I would describe this as perfect.
And the customer service in terms of help has been excellent.

Impressed with the build quality and ease of use. I will recommend this product to fellow CPAP users.

Your service was prompt polite and I appreciate the courtesy’s granted. I find the product, the Cspring water container great for my up and down use required and I don’t have to worry about running out. I wud highly recommend your product and follow up. Thank you

Excellent product

This is my second C-Spring. To be clear I broke the first, not a quality problem. These little machines are just so convenient. Makes cpap compliance much easier. If you’re considering your first here are my two pieces of advice: 1. If you like sleeping in the dark, Get the blackout cover, full stop. 2. It’s ok to cut the hose to a good length if there is far more than you need between the c-spring and your cpap. Having a ton of line coiled up is a bit of a pain. If you make a mistake repayment is cheap.

Great system. Easy to install and so far is working great.

Worked easy and well

No issues after.2 weeks of daily use. Works as intended and keeps the tank full without water.leaks

I have bad allergies. For many years I have depended on a hypoallergenic filter in the CPAP and an inline bacterial filter. This kind of helped. But with the recent wildfires and their smoke, I was coughing all night and needed to try something else. I bought a Cspring CPAP HEPA filter. Installation was easy, and I experience far less respiratory distress. This is such an obvious issue that I am surprised that no one came up with a product like this before. Highly recommended.

Much easier than the older model.

It is good . They send me adapter for AS10 Hose and now I can attach it to the nozzle inside. Will not dy the hose. Have to use the hurricane dryer. Heve to unplug other wise keeps running hot air. Citric acid leaves residue in humidifier chamber. Dawn works better.

New refilling tank. Solved the problem filling with mini. Guess tanks wear out. Problem solved. Thanks

Excellent quality and fast shipping. The MK3 is my favorite CPAP accessory! it has made my therapy so much easier and more comfortable. Very happy with my purchase and would definitely recommend!

Filter replacements are the right size very easy to replace.

Nice back up should u have to move the chamber somewhere away from the CPAP machin