What is growing in my saltwater container?

[Sebreef93]

I have a container that I keep saltwater mix that has been made. Today I noticed that there are some brown stuff growing at the bottom of it. I did a ammonia test and seems to be around 0.25ppm. Does anyone know what could it be? Many thanks in advance!

 

[danimal1211]

What type of salt are you using and how long have you been mixing it in that bin?

 

[tautog83]

Clean it .lol

 

[Sebreef93]

What type of salt are you using and how long have you been mixing it in that bin?

I'm using TMC salt. Bin had been used for 5-6 months. My RO container is clean. Additionally I tested both RO and saltwater for ammonia. RO was 0; however, saltwater gave me around 0.25ppm.

 

[Sebreef93]

Clean it .lol

That's the plan! But first of all wanted to know what could it be so I know how to prevent

 

[danimal1211]

Most salts leave a residue that builds up over time. While testing for ammonia wasn’t a bad idea a reading of .25ppm is likely a false positive as most ammonia test kits will always show a non 0 reading.

 

[Dan_P]

Most salts leave a residue that builds up over time. While testing for ammonia wasn’t a bad idea a reading of .25ppm is likely a false positive as most ammonia test kits will always show a non 0 reading.

Agree ^^^ with one clarification. Salts can be contaminated with a low level of ammonium. Not a concern though.

 

[Sebreef93]

Good to know, thank you so much for your prompt response!