Correcting PH in Grodan sugar cubes

Airwalker16 said:

Being closer to 6.5 is good. More cal, mag and other nutes are more available.

Click to expand...

McFrosticles said:

In hydro? Everywhere seems to say 5.6-5.8 is better

Click to expand...

McFrosticles said:

I'm growing 7 plants in 12 litre buckets filled with grodan, but probably filled with 10 litres of medium.

Watering with nutrient solution PH'd to 5.5/5.6. Tonight's watering I poured 18 litres through each bucket and had to stop as it takes so long doing it all by hand. So about 125 litres of solution with 70 litres of run off gave me a PH run off of 6-6.1 in each bucket

Can I drop the PH of the nutrient to say 4.5? or does it not work like that?

Also I cant find any info on how to calculate run off, I know it should be 10-30%. Is that volume of the whole pot, so a 12 litre pot would have 4 litres run off?

Click to expand...

JDMase said:

You can drop your input pH down to equalise your medium pH but I wouldn't do it so significantly. Now you're at 6 run off I would water my next watering with 5.8 and test run off after that.

Sounds like a lot of watering. You'd do better to get a reservoir and a dripper system.

Click to expand...