what are the benefits of using r/o vs tap water, if you use r/o water you have to add cal/mag suppliment back so not only do you have the cost of replacing the r/o filters each year but you also have the outlay of buying a cal/mag suppliment, the difference with tap water is it will already contain calcium and loads of other additives like flouride and chlorine etc etc which isnt nessecarily good for the plants but they can handle it its only when tap water has a high background ec that it becomes unusable, most nutrient companies compensate for hard water with their nutrients
also the type of lights you use also determines what water is best for your plants, we both grow using l.e.d lights and the plants use more cal/mag for some reason so by using r/o water with a base of 0 we would have to use a lot more cal/mag suppliment to compensate for the removal
if your using an r/o filter and then adding tap water back it kinda defeats the object of using r/o you might aswell just use tap
im trying to find a nutrient regime thats suitable for growing cannabis under l.e.d lights so trying to hit the right n-p-k values is more important to me than using r/o water
most indoor studies would have been conducted using hps lights as this has been the growing standard for years where as l.e.d is relatively new it would be a case of finding the n-p-k ratios cannabis uses under these lights and making a nutrient for them to excel,could we see results from a 300 watt l.e.d matching that of a 1000watt hps if we had the nutrients tailored to grow under l.e.d lights?
obviously thats not a question i need to ask but its more for the scientists to investigate and see if we can produce the same if not more yield using less energy
interesting questions seymour. Have you ever considered growing with the mono range of nutrients from canna or similar and experimenting with your own NPK ratios?