Not sure but dropping Ph seems to be a generic issue with de-nitrators - I
wonder in fact if that is a mis-nomer & it is a secondary effect of dropping
Kh. If you have a coil running now I'd be interested to know if there is a
variation between the Kh in your tank & that coming out the coil.

rgds

I.

droping co2 is ALWAYS an issue at least in part its how they all work, one could power
there denitrator with an air lift in which the end output would have normal co2, or use a
venturi, output into a skimmer will do it. the list goes on and on, ive been through this
before but just to be certain ill test the Kh of a quasi control tank a 10gallon with
nitrate levels of 200ppm i put an already established coil onto it from another tank. the
Kh was 11dkh its been going sence 16:00pst ill test again at 21:00pst then sometime
tomorrow and post all the #'s btw its a large coil and will circulate the tank water in
aprox 2 hours. I might check it then just to see what the #'s come out as, but wont post
them at that time.

my other tanks that run denitrators full time including a FO(gets no addatives) have had
no KH issues

ps delayed post forgot to hit send
--
richard reynolds