I have read up on this topic a bit. I looked at the Jandy chemlink 1900. I can see how ORP is not very reliable. The ph is nice to control the salt chlorinator. It would also be nice to have a pump for the acid. Is it worth 1000 dollars or so? I will admit I am very lazy and anything to make the pool less maintenance is a big plus in my book. Just looking for thoughts to see if this is really worth while. I know the probes must be replaced yearly. I don't plan on running any ozone. This is mainly to control the chlorinator and acid.