I had a water filter (Pentek Gs-6ro) installed in a drinking fountain quite some time ago. I would like to get into changing it more frequently. I just looked up the filter that was placed and it doesn't seem to be readily available. My question, is there an inline filter that will work the same and should it have the 'quick fit' attachments? It appears to me that the fittings are on the copper pipe, but the image of this filter online doesn't look like it has anything to twist onto. I can't see how it's connected and don't really want to take this one off without a new one to put in. Thank for any help anyone can provide!