Ok so I have used Kent religiously for 2 years now. I have tested off and on a few times and always the same results 7 dkh and about 550 calcium....
I have to be honest with myself and with others. I have seen a small decline in my tank the last few weeks as I have had a red slime problem. So I thought that it was from me trying to kill the slime. I have also been chasing an alk swing which I thought was from me adding media to my calcium reactor and cleaning the reactor. Turns out that maybe the salt has been my problem...... I try to keep my alk around 8 and my calcium high 4s low 5s has always been ok for me. I will let my results speak for themselves and you can see where I have a problem. I will say it seems to be this batch of salt that I got from the aquamart sale (nothing wrong with aquamart, just trying to determine what batch).
I do a 55 gallon water change once a week. I pre-fill a 55 gallon tank with rodi and I preheat the water as well. I use 1 bag and 6-7cups of salt. I store a bags worth of salt in a salinity bucket that has a good seal. I mix the buck as I take salt from the bucket.
I used 2 test kits on alk and calcium api and Hannah. Used Hannah on phosphate and red sea on magnesium.
SG 1.025
Temp 81f
Alk
Api changed color at 12
Hannah 12.02 .....215ppm
Calcium
Api never changed 26 drops off the chart.
Hannah 600 ppm
Phosphate (note tds out of the rodi .01)
Hannah .02 (also tested my tank .02)
Mag.
Red sea teat kit.
Honestly its no wonder I'm having issues
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