Yeah I’ve test this and noticed it multiple times. I use a hanna checker alk tester I calibrate everything every 2 months. On top of that I’ve backed up these results with a salifert and api spin test or whatever they have at the LFS. I have a line from the skimmer to the outside could that be doing something? Originally it was to keep my ph up.
I’m gonna assume you haven’t read what I replied to all those comments.
Had a look at your build thread. Are you still adding pH increasing stuff to your top off water?
This is why I’m perplexed because no I’m not adding the buffer to my ro as it decimated my Calcium levels. But it was to keep ph up but then I ran a hose from the skimmer outside.I’m running Red Sea coral pro so possibly that high alk content is adding to the problem. But could that be causing Dailey swings I’m gonna test my alk in about 30 minutes then when I get home from work I’ll post the numbers it will prolly be a insane swing.
I did actually. Which is why many of us are confused. I'll check out your build thread but @Garf may be onto something with your ATO water perhaps.
ATO Is offline. I’m hand topping off 2-3 times a day in small increments. And no buffer in the RO anymore it’s been like that for months
All Hanna checkers that are calibrated once every 2 months religiously. My salinity is 1.025. My ph goes down when my lights turn off not much but it does and it starts comin back up when lights go back on.
Ok what is your pH, also do you heat your water change water to match your tank water? The reason I ask is the Hanna salinity checker doesn't compensate for temp change very well I only use it as a reference to my Milwaukee digital refractometer.
Just curious when was your last water change? Also what is your current pH? I asked a couple times trying to figure out why you are not precipitating out any alk.
Ph is at pretty much 8.2-8.25. Yes before I do a water change I heat the water up to basically the same temp. I do you that to check temp aswell as the little thermometer I use for the tank.
