Not sure about the salt. Maybe that would've helped the piri-piri grass solution I made from burning.
The seal cracked and I ended up discarding it anyway.
Just a note of caution for sterility for the eyes.
https://www.amazon.com/Christophers-Formula-Herbal-Eyebright-Fluid/dp/B000S86VC0/This product has some pure grain alcohol in it. Even Cayenne.
I've used it as an herbal eyewash before,
which might be a suitable method for you since your solution is more dilute?
The directions for that product:
Shake Well. Place 3-5 drops of the herbal eyewash extract into each of the two CLEAN & STERILE eyecups, one for each eye (left and right).
Pour boiling distilled water in each eyecup almost filling it to the rim of the eyecup glass.
Let the two full eyecup glasses cool normally to room temperature. (Do not use until the eyecups and eyewash solution have returned back to room temperature. Do not use if either eye cup glass cracked during this process.)
With contacts removed and once the eyecup and eyewash solution cooled, tip head forward, put the eyecup with solution up to the eye and press it gently against the face with the eyecup surrounding the eye.
Tilt the head backwards, blinking the eye as though swimming under water. Blink a few times. There will be a burning sensation (during and slightly after this process), which will turn the eye red when using the eyewash, THIS IS NORMAL! (the burning sensation will go away)
Repeat the same process with the other eye, using the clean solution (do not use the same eyecup for the other eye). The best time to do this procedure is before retiring for bed.