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I have a Culligan Mark 89 that is over 20 years old. I've had ALOT of trouble with water pressure for the past 4 years. When you first turn on water anywhere in the house it has great pressure, but within a few seconds it goes to nothing. You cannot have water running in two places at the same time. I recently changed the regen on the softener to every night and cleaned out the salt tank, but this hasn't helped. Any ideas?
 

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Poor water pressure

I have a Culligan Mark 89 that is over 20 years old. I've had ALOT of trouble with water pressure for the past 4 years. When you first turn on water anywhere in the house it has great pressure, but within a few seconds it goes to nothing. You cannot have water running in two places at the same time. I recently changed the regen on the softener to every night and cleaned out the salt tank, but this hasn't helped. Any ideas?
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At first blush, this sounds like a bad water softener - the unit may be clogged from the age of the system. If possible, by pass the softener temporarily and see what happens. Some softeners are equipped with a bypass valve. If the softener has an inlet strainer, check it and clean as needed.

Also check your incoming water pressure especially if you are on well water. Make sure the main inlet water valve is all the way open. If it has a strainer, check that as well. You should also exercise this valve periodically (open and close it). Sometimes they become clogged or trap something (like sand).
 
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