buy a new one, they use a sealed mechanisim unfortunately it would be virtually impossible to repair if the pipes, cylinder or fitting were damaged.
Whatever amount of pressure was used to compress the CO2 originally, can be reached (or nearly reached) when it is released into an air cylinder.
Normally it is done by weight. The empty cylinder weight is known and the weight with CO2 is taken and the CO2 weight is found.
It depends on the model, but most only need one.
The amount of CO2 in a SodaStream bottle varies depending on the carbonation level desired. Typically, a standard SodaStream CO2 cylinder can carbonate up to 60 liters of water, infusing it with approximately 0.5 to 0.9 grams of CO2 per liter, depending on the user's preference for fizziness. In terms of total CO2 volume, this equates to around 30 to 54 grams of CO2 per cylinder.
According to the manufacturers instructions.
Indefinite. Usually they are tested & certified annually.
You should replace the CO2 cylinder of an inflatable PFD when it has been used to inflate the device, if the cylinder shows signs of corrosion or damage, or if the expiration date indicated on the cylinder has passed. Regularly inspect the cylinder and ensure it is properly installed and securely tightened. Additionally, it's advisable to check the PFD's manual for specific manufacturer recommendations on maintenance and replacement intervals.
You probably could fill it, but not to pressures needed for paintball gun operation, CO2 tanks should not be filled with any gas or liquid besides CO2. edit: you could use Argon in a HPA tank but not a CO2 tank
a 5
The 15XT has a built in seal.
Carbon Dioxide, or CO2, is dissolved in water to carbonate it. A "seltzer bottle" uses a CO2 cylinder to make carbonated water from tap water.