I posted this question over on the Pumping Station, but I guess it actually belongs here. Mods, feel free to delete the other thread.
So my IntelliPH has been working great but recently (it seems to have happened after I had some backpressure issues which I think I have fixed) the feed tube from the canister to the injector tap has been popping out. First it popped out of the injector side, so I put it back in and tightened it up, then it started popping out of the intelliPH pump connector.
I noticed a trickle of water flowing _back_ from the injector, so seems maybe my check valve is shot? Is there anything else that could cause this?
I've ordered another valve and it should be here by Fri hopefully, for now I have the IntelliPH set to Off.