I just tested my TDS in my RO/DI water, and it’s showing 0-1ppm (the inline TDS shows 0ppm)
I made saltwater (35ppt) and added 18g of sodium bisulfate to lower the alkalinity to around 7dKH.
I tested the water only a few hours after adding the acid. In my initial test, I rinsed the beaker inside the clean saltwater to ensure no residue could skew the results. I rinsed all my vials and syringes a few times with salt water. I collected my first sample of water in a beaker.
The phosphates from the beaker were 0.12ppm.
I took the second test sample directly from the brute trash can (I only put clean saltwater inside), and it tested 0.16ppm, which was higher than the beaker.
I am using Hanna ULR PO4.
Are the phosphates coming from the RO/DI, the salt (instant ocean purple,) the sodium bisulfate, or somewhere else?
I want to believe it’s coming from my RO/DI, but I tested my water after the membrane (ICP around 6ppm), and there weren‘t any phosphates in that ICP. The ICP (ATI) tests freshwater separately from saltwater.
I made saltwater (35ppt) and added 18g of sodium bisulfate to lower the alkalinity to around 7dKH.
I tested the water only a few hours after adding the acid. In my initial test, I rinsed the beaker inside the clean saltwater to ensure no residue could skew the results. I rinsed all my vials and syringes a few times with salt water. I collected my first sample of water in a beaker.
The phosphates from the beaker were 0.12ppm.
I took the second test sample directly from the brute trash can (I only put clean saltwater inside), and it tested 0.16ppm, which was higher than the beaker.
I am using Hanna ULR PO4.
Are the phosphates coming from the RO/DI, the salt (instant ocean purple,) the sodium bisulfate, or somewhere else?
I want to believe it’s coming from my RO/DI, but I tested my water after the membrane (ICP around 6ppm), and there weren‘t any phosphates in that ICP. The ICP (ATI) tests freshwater separately from saltwater.