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Has anyone been checking the conductivity of their tank over time using PPS pro?

I check it weekly and it seems to increase the equivalent of 20 - 40 ppm per week.

I usually do a 20% water change and this brings the total dissolved solids back to my goal of about 180 ppm.

Any suggestions as to where the extra ions are coming from?
 

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Discussion Starter #5
A Jedi???

I guess water changes are actually still needed with PPS then from what I read above
Yes a Jedi!!!
When you click on someone's post and look under their name it shows their APC status. Brilliant is a jedi! How can that be?
 

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I too have noticed that, using PPS-Pro, slowly over the course of a month my TDS creeps up into a range that I'm not such a fan of.

Over the course of 2 months TDS increased to a level that was detrimental to my softwater loving plants.

Now I do about a 20% WC every ~2 weeks.




Still beats 50% weekly WC in EI.
 

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the potassium brings up TDS also. cant remember which brings it up faster :
an equal weight of calcium, magnesium, or potassium.
 

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the potassium brings up TDS also. cant remember which brings it up faster :
an equal weight of calcium, magnesium, or potassium.
That would mean that there would be an increase in K, which I test and control for; so, it cannot be adding to the increase in conductivity. I check for KP&N weekly; so, K+, PO4(-3) and NO3- should not be adding to an increase in conductivity.
 

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? I only mentioned potassium as a contributor to TDS

ray said:
That would mean that there would be an increase in K, which I test and control for; so, it cannot be adding to the increase in conductivity.
you're going to need some pretty accurate testing and precise measuring to guarantee you are not increasing some component of TDS as you dose. And accounting for all the different things going on in the tank, how those processes affect conductivity.. Please dont take that as a challenge to lay out a bunch of science and actually attempt to account for it all.
 
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