What device or combination of devices can i use to automate ppm in a resevoir tank. Ideally, when the ppm is too low, it'll add nutrients. If the water level is too low, it'll add water. If both are low, it'll add nutrinet water. I've got everything else automated, I just don't want to use ph adjusters and just control ppm and hopefully use one tank for the entire grow. At most 2 tanks. Is it easier to just do it myself? And would you reccomend a dwc system or recirculating? Cheers. Sorry for possible newbie ignorance.
the amount of ppm required in the water depends on the age(size) of the plant, what computer other than a human can calculate to such fine requirements