There are several posible things going on here. First on the repairs
you have done. Were you getting advice from someone on what to repair yourself? Usually people don't get into annualar rings, spool valves etc. on their own. Second the news is good and somewhat bad. If you have been happy with your water
maker over the years, the good news is that your 200C is repairable at far less cost than a new one. 200Cs are one of Spectras first units built, so it is around eight years old as you state. When the production drops off as you indicated over to half in a few months chances are good that it was not the membrane. Now if the membrane you replaced was the original then I would say that you got a very good service
life from it and it would have been time to replace it anyways. Eight years on a membrane tells me that the water
maker was very well taken care of. At this point with a new membrane installed and production still at half there is only two possibilities of what is going wrong. It is either the feed pump or the Clark pump or considering the watermakers age a combination of both. The first to look at is the feed pump. You say it is good, how did you test it. There is a quick test that must be performed to to check for a bad feed pump. First, with the unit running, pinch off the brine discharge hose with a pair of pliers or kink it off if you have enough hose. Watch the pressure guage closely while you are doing this. With a good feed pump the pressure should quickly climb to the 125psi range (give or take 10psi) and shut off and on momentarily. If this happens your feed pump is good and it is delivering enough pressure. If it does not climb to those pressures and lets say it hovers around 40-80psi and keeps running then the feed pump head
needs to be replaced first. If all is well with the feed pump and production is still only half then it's the Clark pump. The important question here is, are you the original owner of this watwer maker? If you are then you are in luck because Spectra warranties their Clark pump to the original purchaser for as long as you own it. If you send it in to them they will pull it completly apart and repair anything that is wrong with it they find. Your only cost would be shipping
. If you are not the original owner then I suggest that you take advantage of their exchange program you refered to. It is no longer$350 but rather $450. Also if the cylinders are badly scored they will charge you an additional $200 for new cylinders on top of the $450. I would higly recommend you send your Clark pump back, it's a lot cheaper than buying
a new Clark pump and it will be like new when you get it back. You will need to call Spectra directly and ask for an RMA number. Also you will need to provide the serial
number on the Clark pump, it is below the pressure relief valve. It is a four digit number followed by a "-" and either a 7 or a 10. Also the voltage of your unit, probably 12V.
This is important as well. Before you remove the Clark pump you must pickle the system to protect the membrane. (Only use the SC-1 storage
compound to maintain the warranty) Remember this is done with the pressure reielf valve open. So even with a weak Clark pump it will still pickle the system no problem. Once this is done carefully remove the Clark pump from the system. Remove the mounting bracket/s on the bottom of the pump and keep them and the bolts. Also remove the brine discharge quick disconnect and keep it as well. It can take about three weeks for a normal return. Once you do all the above you should be fine. If you have any further questions either now or later you can give me a PM as well.
PS. Don't worry about your water maker becoming obsolete. Once you are done with the above you will still have all the same parts
used in a new Spectra water maker.
Good Luck Tellie.