What do you know about installing an AN filter? You should use regular water treatment equipment drain line so you do not reduce flow which is already flow controlled and any reduction will cause the filter to fail. And why would not be able to slope a piece of regular drain line? Frankly it usually is easier than PVC because you run it all in one piece with no fittings in the run.
I don't think so.
You should be leaning on the dealer and he should be telling you how to program the valve and you should leave it alone. Problem is that most of my competition with the Clack do not tell their prospective customer how to size or, their customer how to program the valve. That includes softeners also. They also don't include the 3-7 pages of very detailed assembly, set up, programming and installation instructions that I do. IOWs, you get much more if you buy from me. I doubt that any of my customers are contacting my competition for info on how to do things with the equipment they bought from me; but I hear from their customers fairly frequently.
Click Here to learn how to correctly size or program a water softener.
CAUTION, as of Nov 12 2013 all YouTube videos showing how to rebuild a Clack valve have an error in them that can cause damage.
I just wanted to thank everyone for the information they provided. It was a very enlightening exchange.