Hi, which ph probe are you using, does it just push in and secure with the lock nut or is the a O ring as well?

Cheers

Les

It will depend on the diameter of the probe. the one i am using has a rubber ring (its not an "O" ring, its more like a ribbon flat rubber ring), because my ph probe is smaller diameter, but if you have larger diam probe you will not need that, i am not at home right now, if you need me to measure the probe that its in now please let me know.
But you are right there is a nut to secure it in place.
I am using American marine Ph probe.

Thanks for the reply, I have ordered a pinpoint probe to use in the reactor, do the come with the rubber ring? if not are they available somewhere? also does the ph in the reactor go up and down during the day the same as it does in the main tank?

Thanks

Les

PH probe does not come with rubber ring. i dont know were to get one. My calc reactor came with it.
PH is stable inside the reactor. as long as you keep your bubble count and effluent water flow stable.

Cheers and thanks for your help and advice

Les

Ok it has been almost a year, just finished re-filling the reactor.
Still very happy with it. All i had to do is to open it by undoing the screws, took some water out with turkey baster, washed the intake protecting sponges, dropped in some more calc. reactor media, closed the top cover and it was done deal.
Didn't even remove the reactor from the cabinet. Had a tiny water spill but because i have it inside the plastic can it was ok.

Running externally everything is well. Pump is still very quiet the only way to tell if its still running is by touching the pump or when media inside moves.

Highly recommend.

Good old Bubble Magus. Their slogan should be " Aquarium crap doesn't need to be that expensive to be good"