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Culligan ac15 which filter comes first, the sediment or the carbon filter in Culligan AC15? Thanks

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Sediment ALWAYS before carbon. This protects the carbon filter and gives the best service life. Carbon filters are more expensive so in hard water areas you might like to change the sediment filter twice as often as the carbon filter. At the least, change both filters every 12 months.

Posted on Nov 04, 2013


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SOURCE: For Culligan Aquacleer AC15, Carbon and RO filter

Here is a manual for a Culligan H-30. Basically the same unit. The diagram shows how to replace o-rings.


Posted on Nov 15, 2011

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For Culligan Aquacleer AC15, Carbon and RO filter oring to be mounted towards end of cartridge or manifold?

Here is a manual for a Culligan H-30. Basically the same unit. The diagram shows how to replace o-rings.


Oct 17, 2011 | Culligan Under Sink Water Filter

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Have an under sink Culligan RO system with 4 potential filters but it only uses 3 (was so installed by Culligan). Filters are labeled - reading left to right Sediment SED10 ...

Pre-filter and carbon block filter are changed annually. The membrane is only changed every 3-7 years depending on water quality coming in, TDS and usage. Fourth filter is an in-line carbon filter that goes on the line up to the RO faucet.

Aug 12, 2011 | Culligan Compatible RO Prefilter AC30AC15...

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My culligan reverse osmosis system is making a "honking" type noise. I can feel the blue lines pulse each time it honks, every 10 seconds. What can I do to stop the noise?

There is a problem with the automatic shutoff. There may be carbon fines or debris in it. When the shutoff is trying to close it will have a chirping or light honking noise. Try running all the water out of the tank Make sure you clean and sanitize the filter housings when changing filters.
Here is a link for Culligan RO manuals.


Jun 11, 2011 | Culligan Sediment Water Filter

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May need replacement of a filter or two of culligan under sink filtetrs. what is cost and can another co. do replacement?

I would not suggest having another company replace the filters. Here is a supplier that has Culligan filters I have used.
The pre and post filters should be replaced every 6 months and the membrane needs to be replaced when the product water drops to 80% TDS reduction (3-7 years). A sediment, carbon block and post carbon will typically be about $40-$50 for all three. A membrane will be $50-$100. I know Culligan is expensive but if you can not do this yourself it is best left to the company that knows the equipment.

Sep 21, 2010 | Culligan Under Sink Water Filter

1 Answer

I need to replace the filters on my culligan reverse osmosis ac30 and i got them mixed up...which one goes where

The Sediment filter goes in LEFT cartridge
The Block Carbon filter goes in the RIGHT cartridge
The Membrane goes in the CENTER cartridge

Sep 17, 2010 | Culligan Under Sink Water Filter

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Culligan ac 30 reverse osmosis system - changed the filters, good flow for 3 days then began diminishing. Now nothing comes out of the faucet. Holding tank is empty.

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.

Jun 20, 2010 | Culligan Under Sink Water Filter

1 Answer

Where can I get a manual for Culligan Aqua Cleer?

I found the manual for an Aqua Clear AC15 at the following web site. Go to the below web site and locate the filters for your system. There will be a link to the manual in a .pdf format.

May 15, 2010 | Culligan Under Sink Water Filter

1 Answer

HOw to replace Culligan water filters

For a 4-Stage system:
1. Open the housing caps of the components that house both the sediment and carbon filters (you may need a residential spanner wrench). Put each filter into its proper housing and tighten housing caps MANUALLY. Do not use wrench.
2. Repeat process with membrane housing and membrane (if membrane needs replacing).
3. Remove inline polishing filter by disconnecting tubing at both ends. Replace with new inline filter and reconnect tubing.

Dec 18, 2009 | Culligan Under Sink Water Filter

2 Answers


Your best course of action is to contact Culligan here:

Nov 15, 2009 | Culligan Sediment Water Filter

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