One more thing i just thought about. U may want to mix ur dilute water at half tap water and half distilled water (r/o) so u dont loose too much of ur cal.mg concentration in ur mix while u are dilluting. Unless u have a cal.mg supplement that u can add while dilluting ur mixture. Only reason I say this is since u are making a fresh batch each time at the moment all stages would be recieving the full dose of cal.mg coming from ur tap. But I wouldnt use tap by itself to dillute because this could increase the ratio of cal.mg going to ur younger plants.