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Randy Holmes-Farley · Apr 3, 2018

Great! Thanks for posting the detailed report!

Before you started the controller, and noted some days the demand and dosing did not match, did you ever see any correlation between pH and how the tank demand changed?

Were you dosing even 24/7 before the controller?

How would you say your daily usage of alk changed on going to the controller (up, down, same, etc.)

road_runner · Apr 3, 2018

chipmunkofdoom2 · Apr 3, 2018

Ohashimz said:
7- KHG use a reagent that can be dumped back in the tank, i was very sceptic of this at first, but i sent a test water sample to ICP test and all parameters came back within the recommended values, i did not see harmful sustains. that being said i am not doing that and instead dumping my KHG test water in my skimmer waste container

The "reagent" that the KH Guardian uses is likely just a concentrated acid. We can infer this because the KH Guardian computes carbonate alkalinity by adding an acid to the water until the pH reaches 4.5 (this procedure is outlined in Randy's article on DIY alkalinity testing). At a pH of 4.5, the bicarbonate has likely been converted entirely to carbonic acid. By keeping track of how much acid is added, you can calculate the carbonate alkalinity. So, when you add the "reagent" back to your tank, the only thing you're really doing is lowering your alkalinity ever so slightly. You're adding a very small amount of water with no carbonate alkalinity to a very large amount of water with regular levels of carbonate alkalinity. The effect is likely invisible to the end user.

road_runner · Apr 3, 2018

erky · Apr 3, 2018

"How would you say your daily usage of alk changed on going to the controller (up, down, same, etc.)" can you kindly clarify?
I think Randy means -how much you used to dose (24/7) vs current needs. is it the same amount or lighter/heaver

great looking tank as well.