How much salt(Na) is okay?

[PsillyRabbitOG]

I see in the search the exact question is asked but read that thread and found no answer.Just people talking about filters.
I am having trouble finding out how much (Na) is "okay". It seems the answer is not zero from what I read a small amount of salt is actually optimal especially for seed production.
My meter tells me the amount of salt in % and total PPMs.Do I divid the % of salt into my total PPMs to figure out PPMs of salt?

Sodium Absorption Ratio (SAR)​

Acceptable range is less than 10 mEq/L(mEq/l is short for milliequivalents per liter)​

• Problematic range is 10.1 – 18 mEq/L
• Severe problem range over 18 mEq/L
• 
  Sodium
• Naturally occurring from dissolved minerals, but Na also comes from road salt and fertilizer. Levels greater than 70 ppm can cause foliar damage (leaf burn).
• Acceptable range is under 70 ppm
• Problematic range is 70 to 200 ppm
• Severe problem range is greater than 200 ppm

Interpreting a Water Report: How to Make the Most of the Information You Have (source)​

 

[Moe.Red]

I gotta be honest this made my record skip a bit trying to figure out where you are going with this.

salt is a very generic term. All nutes are salts in the general sense. They move thru the plant with osmotic pressure caused by “salts”.

do you have a way of measuring sodium specifically as opposed to the average reading of all salts combined we get with the typical EC / PPM meters? Help me understand your questions a bit.

 

[PsillyRabbitOG]

My meter has a salinity % reading yes. As well as EC/ and PPM
So, yeah, I dunno trying to understand my "salt" reading.

 

[Moe.Red]

Pretty sure your meter will not differentiate between sodium and others so maybe your questions are not exactly pertinent?

I’ll dig up some info for ya when I get to pc.

 

[PsillyRabbitOG]

I hear you. It probably doesn't. Is there an appropriate amount of Na for hydroponic systems or It solely correlates to total PPM/EC?

DANOPLUS 5 in 1 Digital pH Meter with TDS/EC/Salinity/Temperature Measurement Waterproof Highly Accurate Multi-Parameter Tester <--link​