Is flusing with RO water ok?

[Vexor1717]

Hello, new to growing and this is my 1st time using coco coir and using RO water. Does CalMag need to be added during the flush? Do I need to PH the RO water? I see very different options from people and would like some opinions. Thanks!

 

[Cookoo4Coco]

I would defiantly add a little cal mag to the RO before flushing! When im feeling lazy i just add a splash of nutes from my veg reservior. Straight RO water will grab onto all the stuff in the soil and pull it out in a way that is not desired.

Please someone smarter call me out if im wrong lol

 

[Mr.GreenthumbOG]

I’m not using RO personally, as my tap water is first world.
But when flushing/finishing in coco, in the last week or so. RO is fine, speeds up the flushing process.

 

[Odiesel]

Im growing in coco but my flushing will be with tap water similar to @Mr.GreenthumbOG but im sure for the last week or 2 depending on how long you flush will not be bad to use RO i would still PH to be safe which is what i do

 

[Vexor1717]

Im growing in coco but my flushing will be with tap water similar to @Mr.GreenthumbOG but im sure for the last week or 2 depending on how long you flush will not be bad to use RO i would still PH to be safe which is what i do

What do you PH it to? Like 6.0?

 

[MIMedGrower]

No need to ph RO water (or most tap water) it will instantly take on the ph of the medium. It has no alkalinity or acidity.

 

[chemistry]

If it's your final flush before you chop, then use just water, RO or tap, no point in PH or adding anything as your chopping.

 

[XxHammer]

I use RO water myself and always add CaMg. RO is stripped of everything so I put the CaMg back into it from Day 1 with my plants. So far its been going just fine.

I do find that I have to adjust the pH AFTER adding CaMg, usually about 1/2tsp of pH UP for every 1tsp of CaMg (1tsp of CaMg per Gallon), although I may boost this is 2tsp per Gallon after the plants have been transplanted and are a bit bigger.