I started using a nutrient foliage spray about three weeks ago and I must say I see a definite difference. Leaves look greener, larger, and healthier. I am using my usual 5-11-26 nutrient solution at half strength, about 800 PPM. Every few days I lightly spray the leaves down with regular water to get rid of salts. Is there a downside to using this technique especially long term? I don't want to see a short-term benefit at the expense of a long-term problem.