Tin in RO Water

[jose1223]

Hello reefers, I had completed an ICP test and the results returned very high tin levels of 1800 (PDF is attached of the results). A friend came over and we made some changes so I sent a Triton test (faster turn around) to test the water straight out the RODI unit to narrow down the issue. It turns out the tin issue might be elsewhere (piping etc to fish room) but the analysis returned results of sodium , sulphur, lithium, barium , and silicon. In the past 6 analysis these were all at zero. The unit has a new membrane and the resins were just previously changed on my 7 stage unit.

I currently have a water softener and was reading that there are potassium based water softener pellets to assist.

In the meantime going to test my source water before hitting the RO unit plus the water that comes out the pipes in the fish room.

Any help or pointers will be great.

I have also attached the Triton results.

 

[Randy Holmes-Farley]

The tin likely came from plastic or a metal part after the RO/DI.

The second ICP set (ICP data set on the right) is not 0 ppm TDs water. It either got contaminated after it was collected, or the DI is depleted. The TDS is well above 50 ppm TDS (if the ICP is accurate).

 

[jose1223]

Hi Randy, thank you for your prompt reply. Sorry for the silly question, but how did you figure out the TDS was not 0 from the analysis?

 

[Randy Holmes-Farley]

Hi Randy, thank you for your prompt reply. Sorry for the silly question, but how did you figure out the TDS was not 0 from the analysis?

ppm TDS is close to the concentration of normal ions added together (being overly simplistic).

It says there was 42 ppm (42 mg/L) of sodium, and that positively charged sodium must have negatively charged ions with it, likely chloride and sulfate mostly, which will account for more than another 42 ppm. Thus, the TDS is likely over 100 ppm. Certainly over 80 ppm.

 

[jose1223]

ppm TDS is close to the concentration of normal ions added together (being overly simplistic).

It says there was 42 ppm (42 mg/L) of sodium, and that positively charged sodium must have negatively charged ions with it, likely chloride and sulfate mostly, which will account for more than another 42 ppm. Thus, the TDS is likely over 100 ppm. Certainly over 80 ppm.

What do you recommend I do? Change the resin? Or add a special resin with an extra canister?

 

[jose1223]

In the meantime I am going to send an ICP test on my source water and the RO water that comes out of the lines to the fish room that are connected to the RODI unit. I also purchased a SpectraPure High Capacity Silica Buster Color-Indicating DI Cartridge HC to add to the 7 stage.