Chloride (lower) and Sulfur (too high) ICP

[Miami Reef]

My salinity tested 1.0264 two weeks ago when I checked it with my tropic Marin hydrometer. Not sure why ATI ICP shows it is a little lower. I will check the salinity again today or tomorrow.

I use Red Sea Blue bucket and instant ocean purple salt. Lately I’ve been using instant ocean with some muriatic acid to lower the alk in the water change.

I used to use sodium bisulfate in the past to lower alk, but I haven’t in a while.


I dose sodium hydroxide, calcium chloride, and balling part C

I use felt filter socks that I wash in my washing machines with extra rinse cycles. I alternate with 2 sets 2x per week. I infrequently add some plain bleach. The skimmers foam a bit when I change the socks. Could there be soap residue that’s adding sulfate/sulfur?


Here’s the Oceamo ICP I sent on December 2023:

Here’s the ATI result from today.

Thank you @Randy Holmes-Farley

 

[Randy Holmes-Farley]

I don’t think there could be enough of a soap residue to move the sulfate value. The sulfate might reflect starting values from the salt mix, or maybe the formulation of the part C.. I wouldn’t worry much about it since it isn’t off by much.