I've been using it in my hydrating water for my seed-starting Jiffy pucks for a few years.
Works great.
There is no need for nutrient until you seed has sprouted and green. Then feed. The seed has everything it needs to germinate and sprout leaves. It can do more harm than good to have nutrients, any nutrients while cloning or starting seeds. Now remember as soon as its sprouted and green you can feed. Same with clones only add nutrients after you see roots.
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forgetmeplease does have a point, overfeeding and watering can be major causes of troubles. I wait till 2nd set of true leaves start, each has their own way that works - some go several nodes before feeding.
1-2 ml/gallon comes out to about 50 ppm (that's for a decent concentrate, depending on how concentrated it is and the elements in it). Some people are happy with their RO water at that (though mine's 13 ppm). I don't think it'll hurt any, that's my week 2 from seed concentration for RDWC.
Yeah you want to increase your chances of success - I use Rapid Rooters, they have their own nutes plus some beneficials. They blow away rockwool in speed and root mass development. They even beat someone's aero-EZ clone setup. Though some of those EZ cloners turned out to be more of slow cookers at 1st.