What kind of water should i use for vegging and flowering in an aeroponic system? distilled or just regular tap? i heard RO water is a little hard on the plants is that true?

lol R/O water is the best water you can use period. Its the closest to pure water you can get and only rain water (if u dont live neara large metropolis) is better. The only downside is you will most likely have to use a cal/mag product with r/o.

just goes to show you that rumors can indeed be wrong, Reverse Osmosis is the absolute best water that one can work with. Whome ever it is you have been listening to, forget everything they said, because they don't have a clue what the fuck they speak of.

Well, really, the water you use doesn't really matter as long as you know the nutritional and chemical breakdown of whats in it. RO gives us the ability to fully control what we put into our water by first removing everything from it, allowing us to supplement exact nutritional levels to our likings. If you have your water tested and find out what you're working with, you may not need to go as far as an RO filter, but rather, a simple chlorine and sediment filter.

Knowing is everything.

Just a short note about rain water: it can be acidic where RO is neutral.

Apparently rain can be as low as 4.5! That would clearly affect the pH balance of your grow...so, be aware!

Yeah, but say 4.5 pH @ like 50ppm rainwater vs RO water at 4-7ppm, (effectively "no" ph), in a 1300ppm solution, negligible difference in the real world. Might take one more little sprinkle of pH up to get it right with the 4.5 pH rainwater..

Good point Harvey, just wanted people to realize rain is not the perfect water some thing it may be.

pH change is trivial, particularly as water has no buffering capacity whatsoever - i.e. it can be easily altered with minute amounts of acid or alkaline.

"What kind of water should i use for vegging and flowering in an aeroponic system? distilled or just regular tap? i heard RO water is a little hard on the plants is that true?"

Sorry for the harsh SwoLL619, but, I hope you're in the extremely preliminary stages of figuring out how to pull this off. Give yourself a $25-30 present. Buy a copy of a good grow guide. I like Greg Green's Cannabis Grow Bible, but there are several out there. Once you have it, read it and figure out how to apply the info to the space you have set aside to grow in. Then read it again.

I hope you didn't know what RO water was when you started the thread.
In an aeroponic system, with all the small orifices involved, it only makes sense to me to start with the purest water source economically feasible. The purity of distilled and RO water is basically the same...it's just the process that's different.

Hard water (>300ppm) can be hard on plants over time because it can cause nutrients to become unavailable.

Yea i have done my homework i just wanted to see what water would be best to work with. I didnt know exactly what RO water was but i do know now. Yea i forgot where i got RO water is hard on plants but thats why i go ask different people and look in different places to get my info. I appreciate all your guys info and knowledge thank you. If i do use tap i would just have to find out what minerals is in the water and if my water has 300 ppm and im only suppose to give my plants 1500 i should just give 1200 right just double checking.

Swo, simple answer yes.
complicated answer, not really because say you have 300 ppm coming out the faucet and you want to be at 1500 ppm. If you just add 1200, it will indeed total 1500, however 20% of what you have given them is unknown (unless you have a chemical analysis, and even then you don't have control) and therefore your plants are getting 20% potluck on salts, heavy metals, or whatever the heck may be in the water. Some placees in the world, the water is fine, others, not so fine, and others, horrid. If I use RO water, I have 100% control of what those plants are fed and therefore I can attain as close to perfection as possible. I can be the god of my grow room and create the most gorgeous flowers ever seen by mankind. If I use tap water though, I am a god that always has an out when things go wrong because I can say, see, I told ya so, it's the water, I should of used RO. oh well.