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Wear is not the problem that the grit may cause. Problem is that the grit can get into the regulator preventing it from regulating (pressure can spike to FULL bottle pressure going into the marker). It can also cause the tank valve to leak when unscrewed from the ASA.
There are concerns over using any kind of oil in an HPA tank to clean the regulator. Using lubricant to clean externally installed regulators and power valves is a common method. And though there are no documented cases of oil causing explosion of HPA tanks, there are cautions that are not unreasonable.
There are non-flammable synthetic lubricants that can be used to clean the internal valve regulators on HPA tanks. Such non-flammable synthetic lubricants are available for paintball markers from Pro Shops. Similar and less expensive lubes are also available through welding supply stores.
A few drops into the fill nipple as you fill the tank will work through the regulator and help to dislodge trash from the sealing/regulating surfaces to restore function. I have had my tank regulator quit regulating due to dirt getting into it on two occasions. Both times I was able to restore full function with a shot of non-flammable synthetic lubricant into the fill nipple of the tank. Tank valve regulators require the same occasional lubrication and cleaning that external (secondary) regulators do.
The only other method is to have a Pro Shop, with experience in doing this, remove the valve from the tank, clean the tank and the valve regulator.
A hydrostatic test would, as a byproduct of the process, clean the tank, but if the valve regulator is already contaminated it will require someone else to fix it or replace it.
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