It works ok. You can definitely get to harvest with just water but you may need a little extra nutrients if your plants are heavy feeders. If you have any of the concentrate leftover, you can top dress it should you have any deficiencies. If you add any other nutrients, make sure they are organic. Synthetic fertilizers will kill your micro herd. If you don’t have any of the NLS concentrate leftover, I’d recommend just getting a bag of Dr. Earth Flower Girl and top dressing that if you have any deficiencies. Also, you shouldn’t have to pH your water but if you do, do not use regular pH up or down. Use baking soda for up. Lemon juice, vinegar, or citric acid for down.