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Quantity
1
Description
The CSpring Mk3 Automatic CPAP Water Chamber Refilling System is designed to help CPAP, BiPAP, and APAP users avoid the nightly hassle of refilling their humidifier water chamber. By automatically adding water as needed, the CSpring Mk3 helps prevent your CPAP water chamber from running dry during the night, supporting a more comfortable...
Reviews
4.5
289 ratings
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This thing is amazing.
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.
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Bennett · August 21, 2026
I also have the cspring mini the travel pump. Both items are really good the water chamber is a lot more quieter but all there products are very good. I just wish my cspring mini came with a UK plug. As have to use a converter with the plug which is a little annoying when travelling have to take more stuff with. I would still recommend both products though
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REX · July 27, 2026
Automatic CPAP Water Chamber Refill System
Impressed with the build quality and ease of use. I will recommend this product to fellow CPAP users.