Minimum PPM Level of Starting Water

[darqeds]

Hi, i did search but there is no information about that. I bought RO system and its about at 12 ppm as pure water.

Is there any evidence about ideal unfertilized/starting water ppm level?

Note: I had a few grow with 70 ppm water and had no sign any deficiency like cal/mag.

 

[Creeperpark]

(50 to 250) ppm, different strains like different ppm. RO has to be stabilized with cal mag or dolomite lime.

 

[asher1er]

Probably no info because you can start with 0 if you’d like... just need to make sure whatever nutrients you use will make up for the lack for minerals and such..

 

[f-e]

Many like to take their RO to ec0.4 with calcium and magnesium. Lots of feeds expect something like that so are balanced accordingly

 

[Fixer]

For what we're doing there's not much difference between 0 and 12. By the time you add silica, mg/cal and whatever cocktail of nutrients you decide on a few ppm are going to be a really small percentage of what's in the water. So it won't matter. I look at filtering the water as a way to insure you're mixing the same formula every time.