According to the size of your filter housing you need same size Housing Wrench. These are special wrench that can use for twisting off the water filter housing sumps. We have here below a link which have all the sizes of these Wrench but also all sizes of cartridges that you can order directly all together. If you have any questions about sizes you can contact them directly we are sure that they will be more than happy to help you.
http://www.waterfilters.net/Culligan-Water-Filters_c_215.html
In addition to your comment please note that there is not something special, on the housing bottom there is an o ring which is uses to watertight seal with top base. All you need is to clean everything very well with water so all dirt go away and if you have a silicon crease you can apply all the way around the o ring so it will perfect fit and also it will avoid the housing stuck the next time you will try to remove again the housing. We are replacing filter cartridges without using any silicon grease many times and all we need is to force a little harder the wrench. So if you use the silicon grease will make it easier the next time.
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Sitting atop the filter housing cap is a red pressure relief button, which vents excess pressure inside the housing to make installing Culligan replacement filter cartridges a breeze.
Usually you turn the top which turns off the water. Put a bucket under the filter and press the red button. Some water will spurt out to relieve pressure. The filter housing are usually removed with a special wrench. Discard element. Install new one and tighten.
First you want to turn the water off, both the in and out on the filter, then push the red button this will release the pressure in the filter so that you can unscrew the catridge housing. I have a plastic wrench that came with mine. it's just a ring with a handle on it, inside the ring are some dogs that catch the ribs on the canister. If you don't have the wrench, the canister is big enough to get 4 or 6 hands on it to unscrew it
Check an manual in the below link and see if it is helpfulhttp://www.waterfilters.net/PDF/Filter-H...
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I know you turn the water source off, open filter with wrench, (I lost the instructions), but I know there is something about greasing an o ring. I need a step by step. Don't recall red button. I am not near filter, will go to check it out tomorrow.
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