I haven't yet, primarily due to the fact I've been so busy that I hardly have the time to keep my tank's glass clean. I'm hoping things slow down soon, so I can spend more time 'in the hobby'.

I haven't, if I can dig up my old Ca and Alk test kits and if they're still viable I'll post some numbers. The A.R.M. in my second chamber has gone down about 3" in 2 months so there's definitely some addition of Ca and Alk, but seeing as I have no corals in the tank to speak of I haven't been faithfully tracking those #'s, only the nitrates (which it hasn't done anything to reduce :( - in fact, I'll update my other thread since it's been a while - but I'm taking mine offline).

After running some standard tests on my tank tonight, I thought I would update this thread.

However there isn't much to say. I've hardly touched the Denitrator, opting to let it 'do it's thing'. I am pleased to report that my tank nitrate level is down to 5ppm, and the effluent of the reactor was 0. So I increased the drip rate ever so slightly for the first time in well over a month.

All in all, I'm very impressed with this 'hand's off' approach to dealing with mysterious high nitrate levels. It seems to be working wonders.

Sweet.

Apologies if you've answered this already, but what's your mechanism to feed the unit? Separate pump with needle valve, etc.?

I'm using an Aqualifter pump to feed mine now (with an irrigation dripline on the output of the pump, which then pushes into the recirc pump intake). It seems to be holding steady this way (finally!). It just seemed that feeding mine off gravity or just the pump intake before, didn't produce enough of a steady driprate (ie. it always drifted over the course of a few days, or stopped altogether). I almost went to using a lab grade metering pump (went so far as to buy one in fact), but if the $10 solution works I'm going to stick with that (and maybe recover the couple hun I spent on the metering pump, unless I can dream up a way to put that thing to use :) )

I'm using a very similar method. Aqualifter pump with a needle valve on the output of the Reactor back to the tank. (so the reactor is under slight pressure)