2-3 hours doesnt seem that bad to me at all. My DIY design seems to take far longer. I've never really figured out how long it takes but I assume double that time. Next time I take it out to put new fluid in (soon) then I'll try to do it earlier in the day so I can observe how long it takes. I just need new reference fluid... I made my own batch (pain in the butt) accurate to within 1/2 degree KH (I measured it with double the ml of water) but somehow its gone bad. Maybe there was reminants of something in the glass mason jar I kept it in. Now, it goes green instantly when I add the pH fluid, and I've double checked that it is still within .5 of 4*KH. I'm stumped.
Quote:
Originally Posted by Tom Barr
I saw a light reaction method that takes 30 seconds and is accurate to 0.1ppm of CO2 over a wide range. Cost a lot though 
But boy, it would solve many issues  |
How much $ we talking here... hundreds? our thousands? Just curious.