Eliminate noise from pressure tank in Culligan RO water system

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

The storage tank is probably bad. Shut all the water off to the RO, drain all the water from the RO tank, check the air pressure with a low pressure tire gauge. PSI should be 7psi with a 3 gallon tank. 12psi with a 10 gallon tank.
Add air to tank with a bicycle pump.
RJ

This usually indicates low pressure in storage tank. A 3 gallon tank should have 7psi pressure when completely empty. Also if the unit is fed by a piercing valve it may be faulty and not supplying enough water to RO.
RJ

It is quite common to loose air pressure in the RO over time. At times the tank will be full of water but will not have enough air pressure to push water out. Take the tank of drain as much water as possible, for 3 gallon tank bring pressure in tank to 7psi, for 10 gallon tank pressure should be 10psi.
RJ

There probably is low pressure in the RO tank. Take it off, Add some air until all the water comes out. Then set tank pressure to 7psi for a 3 gallon tank. If this is not the case then inspect the water valve feeding the RO system.
RJ

Too much pressure in holding tank will not cause leaks in the RO unit. All too much pressure in tank will do is cause low or no product water in RO tank. Older Culligan RO systems (H8, H83, H5) had fittings that used metal locking washers and these can cut the RO line after the RO has been moved around while changing filters. Newer styles (AC30, Water Tower) use quick connect fittings and the RO line may work loose after filter changes and system being moved around under sink.
Turn the incoming water off to RO, turn the water off on RO tank, open the RO faucet to relieve pressure and pull the line off feeding the RO tank, inspect (you may want to cut off a small portion of the line at the filter) check the o-ring and re-install.
RJ

I would pull out all the filters changed and check them. If a GAC filter is used as the post filter, before the RO tank, carbon fines can come out of the filter and can plug up the head on the RO system. Make sure the sediment pre-filter is not plugged and there is plenty of water supply. You may have lost pressure in the RO tank. A 3 gallon tank should have 7psi pressure when totally empty.
RJ

A reverse osmosis system drinking water system will waste a certain amount of water for every gallon it produces.
1. The higher the TDS (total dissolved solids) the higher the ratio of waste water to product water.
IE: An RO on TDS of 1000ppm may require 7 or more gallons of water to waste to 1 gallon of product water. TDS of 100ppm will have about 3 gallons of waste to each gallon produced.
2. It also depends on the Membrane capacity. Membranes for residential RO systems come sized from 7-75 gallons per day. If you are a heavy water user and have a low producing membrane the RO may not shut off until it gets to rest at night and fill the tank.
3. There can also be a problem with the automatic shutoff on the RO. When the tank fills up and the pressure equalizes across the system the ASO (which is just a simple diaphram system) shuts the water off to the system.
4. If there is not enough pressure in the RO tank the tank may fill up but there may not be enough back pressure to shut the ASO off. So the waste and product water go down the drain and it runs constantly.
RJ

The RO tank will still fill up even without any pressure it just won't push any water out. If the RO tank lost pressure and it is a sealed tank, it should be replaced. The bladder is bad.
A 3 gallon tank should have 7psi pre-charge pressure, 10 gallon 10psi. There must not be any water in tank to set the pre-charge pressure.
If the RO tank is not filling up then there is another problem.
RJ

This might be a possible tank pressure issue. This could also be a clogged filter. I would first check the tank pressure by using the following steps

Necessary Supplies:
1) Tire Gauge marked in 5psi increments (ie 5, 10, 15, 20psi, etc.)
2) Bicycle tire pump for standard type bike tire valve

To recharge RO System Tank:

1) Close cold water feed valve (valve located at some point along the cold water line from street plumbing).*
2) Leaving RO tank valve on, turn tank on side & locate valve stem on bottom side.
3) Remove stem cap.
4) Drain all water out of tank through open RO faucet into sink. (Continue to leave RO faucet open throughout procedure)
5) If current tank pressure is insufficient to empty tank, apply tire pump to valve stem and pump 10 – 15 times. Exit flow will increase and then gradually decrease as pressure equalizes. Do not overcharge internal bladder of tank during this procedure.
6) Repeat step #4 until tank is completely empty. (Tank is empty when additional pumping produces no more water)
7) At this point, adjust EMPTY tank to exactly 7psi. (Gauge reading midway between 5 & 10psi is sufficient)
8) Turn off RO faucet.
9) Replace cap on valve stem and reposition tank in upright position.
10) Open cold water feed valve.*
11) System water is useable immediately, however, tank will take 3-4 hrs to completely refill.

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