Welcome to UK420

Register now to gain access to all of our features. Once registered and logged in, you will be able to contribute to this site by submitting your own content or replying to existing content. You'll be able to customize your profile, receive reputation points as a reward for submitting content, while also communicating with other members via your own private inbox, plus much more!

This message will be removed once you have signed in.


Sign in to follow this  
Followers 0
fatcalyx

using RO water

Hello everyone. I have been thinking of converting to RO water as my tap water has background ec of 0.8-0.9. So i was talking to somebody about using RO water to water my plants, he then told me RO water is really unstable and i will ph it when i water my plants but after a couple of hours the ph will crash to something like 3.0

does any body have any experience using RO water?

all advice is welcome!

FC

Share this post


Link to post


Never used it myself, but a friend says to mix in 1/3 tap water. This will give it some trace minerals, which is needed. Unless you have a bottle to add stuff like calcium.

Share this post


Link to post

Cheers @@KingBlueRizla, yeah i can add magne cal from PM or tap water, i just want to know if there is any truth in the unstable ph? or any other info needed before i decide.

FC

1 person likes this

Share this post


Link to post

Hi ya,

I've wondered about this too.

I've already got an ro unit for my fish.

And yeah you need to add something or raise the kh/gh. This is what give the water its buffering ability, allowing for a more stable ph.

You can add stuff like bi carb and calcium cabonate, or at least you can for fish lol.

If you know your taps gh/kh then you can cut that with the ro to give you your disired hardness.

I'd guess (and it is a total guess) that the soft water ferts would have this added as some tap water can be really soft,

Here it's liquid rock, so following with interest ;)

Atb ✌️

Share this post


Link to post

i use RO my ph drops a little bit over time.ive heard about mixing in a litlle standard tap water but i dont bother. i just add a tiny bit of silica to raise the ph every now n then. love RO water.

Edited by lukio

Share this post


Link to post

Just be aware that RO water if you make 1 ltr around 8 ltrs is wasted back down the drain.. RO can be unstable due to having minerals stopped out which are buffers irc...

Share this post


Link to post

Cheers @@KingBlueRizla, yeah i can add magne cal from PM or tap water, i just want to know if there is any truth in the unstable ph? or any other info needed before i decide.

FC

Yes if you use ro water by its self it will crash as the minerals that stabilise the water have gone. try 50/50 tap and ro.

1 person likes this

Share this post


Link to post

@Mr PM what is kh/gh?

@@lukio hmm I will have a snoop through your stuff on here pal. I already use silicon in my nutrient solutions but as im in pots of coco I cant adjust the ph after I have watered the plants.

@@Arthur Mix I dont think I would get my own machine, I would buy my RO from a aquatics store, about £3 for 25 litres.

@@gpeene i might have to go out and buy a 25L bucket of RO and mix up my nutes as i normally would, and moniter ther ph over the course of 48 hours, one container with just RO, one with 50/50 RO/tap , 67/33 RO/tap and one just tap

would I then need to use soft water base nutes?

FC

Share this post


Link to post

Carbonate harness, and general hardness mate (I know it's a c not a k lol)

I use to mate up the kh/gh with the different salts, to 5 for example.

But now I just mix 1/3 tap to 2/3 ro to bring me where I want to be.

You'd need to know your tap to know how to cut it, test kits are around a fiver, or you should be able to get a general answer for your area on your water boards website

1 person likes this

Share this post


Link to post

I use 10-15% tapwater with ro, ph is as stable as you like. Other benefits over my hard tapwater include; no ph down cost, no chlorine, flouride or sodium. Cleaner pumps and plumbing in general.

2 people like this

Share this post


Link to post

i will have to do some more reading on this and some testing. cheers for the help guys

FC

Share this post


Link to post

There's nothing magical or weird about RO water.

Some people use weak feeds. Minerals in their tap water may well provide enough minerals to compensate for the weak feed. Then they try RO water and hey ho, plants show deficiencies. They add cal/mag and the plants look good again. Use proper strength feed with RO and you won't see defs in the first place.

I use the lucas formula but you can do this with any brand of nutes, you only have to measure pH for the first mix. After that it's rinse and repeat, you already know what volumes to use.

I have a tub on a table fitted with a float valve positioned to give me 20L of RO water. Using separate measuring syringes, I squirt in 40ml of GH Micro, 80ml of GH Bloom and 15ml of Liquid Silicon as pH up. Then I pour that tub into a 50L floor standing tub. Res mixed, takes all of 2 minutes.

2 people like this

Share this post


Link to post

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0