First time hydroponic - Soaking grodan cube question

Greenwize

New Member
Hi :) Im testing out a Hydro setup, and it got me thinking, since I've already put my lovely seedlings into their first rockwool cube, Is it okay to use the first same water you soak the bigger rockwool cubes into for the next stage? I noticed how it changed my low-nute & pH adjusted OS water quite alot, and since its my first time trying out hydroponics im confused, if I should just soak them all in tap water and dont mind the high EC, or use/waste Osmosis water? :)
 
Guess I've must have done this completely wrong, I just watched a second video on YT which explains it pretty fine:


When i pre-soaked these rather big cubes, it was in a quite small container, so it wasnt exactly a proper wash, but still, would it be too much... any inputs? :)
 
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