Hans has been using the Apex model. I don't know how he likes it or his opinion on it. I just know he has been using it
I haven't used it personally but have heard some mixed reviews. Many people love the unit and how easy it is to set up with fusion, the others have had a few issues with them but that seems to have been resolved. It was a problem with some of the earlier serial numbered units so if you're getting a newer one you should be good. May I ask why you are getting rid of the calcium reactor?
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Mainly it's been a PIA to dial in. It's great for a while then all of a sudden I notice the effluent has slowed and alk goes down. I adjust and then I find the alk to high. Adjust again, rinse/repeat. Way to much wiggle room for me.
I do remember reading about some issues with the heads. But I think that was fixed.
The Info I got said I didnt need it because I have WAV.This might be a stupid question but as to your problem, do you have the power cord hooked up to the dos?