Flushing instead of watering between feedings.

Waasaaap fellow botanists? :D
I'm wondering if I can water my plants with a flushing solution ( instead of plain water ) between feedings. The way I understood that flushing removes salts from plant allowing for better nutrients absorption.
And does anyone used Humboldt Honey ES which is a blend of cane molasses, yucca, kelp and ocean fish.
It increases brix levels by providing sugars to beneficial bacteria, fungi, and your plants. When do you use this? If it's organic do you steel need to flush after you use it before harvest?