If by "Holding Tank" you are referring to the bladder tank for your RO, then you need to turn the water off to the RO system, drain the RO tank of any water, check the pressure with a tire gauge at the air valve (just like there is on a car tire). A 3 gallon tank should have about 7psi of air. RJ
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If by "Holding Tank" you are referring to the bladder tank for your RO, then you need to turn the water off to the RO system, drain the RO tank of any water, check the pressure with a tire gauge at the air valve (just like there is on a car tire). A 3 gallon tank should have about 7psi of air.
RJ