React Health Luna G3 Water Chamber

The Luna G3 water chamber is the clear tub that seats in the front of the machine and puts the moisture into the air before it reaches your mask. It holds 360 mL up to the maximum fill line, which React Health builds around a full night.

React Health part LG34510, and it fits both versions of the Luna G3, the LG3600 Auto CPAP and the LG3500 fixed CPAP. The cap is hinged rather than removable, so filling it means flipping the top open and pouring.

Key Features:

• Capacity: It takes 360 mL up to the maximum line, and React Health warns against filling any higher than that.
• Hinged cap: The top flips open on a hinge instead of lifting away, so there is no separate lid to lose.
• When to replace it: React Health publishes no interval, and asks instead that you look for leaks or damage and swap it then.
• The transfer box: A separate piece sits between the chamber and the device, and it stays with the machine when this arrives.
• Why chambers go cloudy: Mineral scale is what dulls the plastic, and React Health names it as the thing to keep off the surface.
• After therapy ends: With the humidifier on, the machine keeps blowing gently for about fifteen minutes to clear the vapor out.

This chamber is ideal for a Luna G3 owner whose tub has gone cloudy, sprung a leak, or stopped sealing against the transfer box. It is a straight swap into the same bay, with nothing to set on the machine afterwards.

Note: Confirm you have a Luna G3 rather than an earlier Luna. React Health publishes this chamber for the LG3600 and LG3500 only, and nothing in the manual speaks to an older machine.

What a chamber does across a night

A heated plate under the tub warms the water in it, and the airflow from the blower passes over that warm surface on its way to the transfer box and out to your mask. The air leaves carrying moisture it did not have when it entered, which is what stops a night of therapy drying out your nose and throat.

That cycle is also what wears the part out. Every drop that evaporates leaves behind whatever was dissolved in it, so mineral deposits build on the base and the walls over months. React Health specifically asks you to keep calcareous accumulations off the plastic, because scale is what turns a clear tub cloudy and eventually stops the lid seating flat.

Care, and what React Health asks for

Let the water cool to room temperature before you take the chamber out. The plate underneath it has been heating all night and React Health raises this as a burn risk, not a suggestion. Empty it and change the water daily, which is the instruction the manual gives for keeping mold and bacteria out.

The method is a soft cloth that will not scratch, dipped in liquid soap only if it needs it, then a thorough rinse and a lint free cloth to finish. No dishwasher instruction exists anywhere in the manual, for this or any other Luna G3 part, so we do not tell you it is safe. Keep chlorine, aromatic solutions and antimicrobial soaps away from it entirely.

Here's everything that comes in the box.

• Luna G3 replacement water chamber with hinged cap
• No transfer box, which stays with your machine