Haaaa I have something funny -
I missed last night on my TDS
meter that it was flashing
"x 10"!!!! when I got the 200ish TDS
reading (it only shows 3 digits and apparently that's how it makes it higher to read up to 9999)
So that salt last night actually made the water 2000 TDS
Meaning the rate would be 1/2tsp per 10 gallons per 1ppm nitrite. It's quite low.
So - just now. I filled a 1 gallon jug with warm water. 17 TDS
. I added 1 tablespoon of sodium chloride NaCl. TDS
Initial pH around 7.2, new pH around 7.4
So it did go up a little - but this was the amount of salt to use in 60 GALLONS of water, and I put it in 1 gallon.
In conclusion: sodium chloride pH raising is negligible, making it the best protective chloride to promote nitrite protection.
Also, for general use, I am NOT a proponent of salt. But it takes 3tbsp for an entire 60 gallons (per 1ppm nitrite). This is really a pretty darn low amount of salt. I see people put in a LOT more as a "preventative" measure (although they are using aquarium salt which is larger chunks)
I also ran a check that I was reading the TDS
meter properly. I added more salt to the jug until I read 946 x10, then I added more salt and it would no longer give a reading. This TDS
meter goes up to 9999 so that was what I expected.