Water

Just a few questions I would like to ask different people to see what people think works the best.

How often do you change your water in your reseviour?
What pH do you prefer?
Where do you get your water and how do you prepare it?
Favorite hydro nutes?

Basically all water questions...

2 Weeks, top with water if needed.
5.5-5.8 since my ph tends to rise slowly so it gives me a couple day buffer.
Just bought and installed R/O system. If your tap water sucks, go get one now.
Only tried AN 3part thusfar. When they run out I think I will go to AN 2part and use the bud blood/bigbud/overdrive combo

What 3 part and what 2 part?

Advanced Nutrients has the Sensi 2 part, and also a Grow Micro Bloom 3 part. I started with the 3 part, and I think it is meant for those used to GH nutes. But I want the simplicity of the 2 part once it runs out.