i have some Grodan Gro-blocks, i know that you have to soak them in p.h. 5.5
my question is should i use lemon juice or sulfuric (battery) acid ?
i kinda need to know asap 3 of my beans are almost ready to be planted

either works, it will take less sulfuric acid than lemon juice to make the solution 5.5. add any acid to make your solution 5.5 - the strength of the acid determines how much to add.

For hydro Use the acid.Lemon juice fades after a day or two.It mucks up standing water too

so I'll soak them in sulfuric @ 5.5 p.h. level for a few hours then should i flush them with 5.5 after or just let them sit?
i want to get it right this time around so i'm being extra careful., so any advice would be very helpful..
thanks in advance

rock wool is ph neutral. the plants like the 5.5 ph, so when the rock wool is 5.5 the plants will like the rock wool. now the trick is keeping the ph at 5.5

so how do you go about doing that?use only 5.5 water?

the simple answer is yes...but it depends on how you plan to grow, what system you use, what kind of water you have.

5 gal bubbleponics i think and tap water..

Hey Mylife, What you are asking is do you soak the rock wool in acid and then flush them with 5.5 ph water. NO.Adjust your water {tap water after it sets for 24 hours}to a 5.5 PH and soak the cubes. Drain the cubes and plant your plants.If you can post a pix it would help alot for us to help you better too.Go to the DIY forum and look at the sticky called PH Minus by lagboatlenny it will give you the battery aicd mix. Peace

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