Growing Lemon Trees from Seeds, 5.10-5.32 Years

I got a new tankless reverse osmosis system that produces reverse osmosis water fast enough for me to not need to use the horrible basic hard tap water (pH 8-9, 500-600 PPM of dissolved solids) of San Diego County, and more specifically, Carlsbad. Using reverse osmosis water will desalt the coco coir and lower the pH to the optimal range of 5-7 pH for plant nutrient absorption. All my plants look greener and healthier after 2 months of water with RO water in lieu of tap water.