I store my RODI in a Brute trash can as well. I use a BRS 5 stage 150 gpd RODI system. Prior to making salt I use a refractometer to test my RODI and its always been 1.000 sg. I've never seen TDS creep up. Possible something has gotten into your can that you might need to washout and rinse with RODI. Do you have a TDS on your RODI system? My whole house has a water softener and with the BRS RODI the TDS is always 0.
TDS is just a measure of conductivity between two electrodes. (Detecting ions in the water)
Yeah I’m going to try that. It’s in my garage which can be dusty at times. I do have a TDS meter. The in-line one says 0 after DI stage. My Rodi usually sits for a couple weeks before I use it all up for top off and saltwater mix. That’s good to hear that you have not seen this. I’m going to continue to investigate what’s getting into my water from sitting in there.
Interesting. I wonder if that’s my issue.
I understand TDS I just feel that as long as the the lid stays on the storage can and nothing is unintentionally dumped into the can the TDS over time shouldn't really change. At least any measurable change. I could see a TDS meter reading slightly different just due to inherent variations in accuracies of the TDS meter in use. Either way I feel like it would be negligible and wouldn't matter enough to worry about it. Just me though. If he's seeing significant swings in TDS then something might be in tank that requires cleaning.
As stated by Randy and pretty much all others nothing to be concerned about, 'not an issue', assume you're just trying to understand it.
In my simple mind I would think one 30 gallon per month WC would have a similar effect (tank size dependent obviously).
aquariumstoredepot.com
Did they make commentary on how much they profit on each salt? Red Sea claims it's not clay and that's also a debated conspiracy for a long time now.
Oh boo. Shows how much I know, lol. LFS must have his tinfoil hat on. Granted it does look like clay. I wonder if anyone has had it analyzed, or if RS has addressed it.
Thanks for the info and article. From what previous posters have said it looks like I might look into changing salt. If I do it slowly over time using my AWC it should have less of an affect on my parameters than someone who does larger water changes. I'll just monitor the main parameters over the time period to ensure I change my dosing requirements as needed. The BRS precipitate video was very helpful and has me leaning towards Tropic Marin. The down side is I haven't found an LFS that carries it so I'll have to rely on an online store. Something I don't mind doing however it can present a problem if I find myself in a pinch and need salt right away. I should be fine if I keep and eye on my salt consumption.here's an article on salts, pros and cons. It tells you which salts use the anticaking agents
The 7 Best Reef Salt Mixes of 2026 – Reviewed And Tested
Mark has mixed and tested reef salt brands across his 125-gallon reef for years. Here's which mixes are batch-consistent, correctly balanced, and worth using in your system.
Like you, that opinion piece is repeating unsubstantiated information that is, IMO, not accurate.here's an article on salts, pros and cons. It tells you which salts use the anticaking agents
The 7 Best Reef Salt Mixes of 2026 – Reviewed And Tested
Mark has mixed and tested reef salt brands across his 125-gallon reef for years. Here's which mixes are batch-consistent, correctly balanced, and worth using in your system.
