I didn't mean having two in rotation was a waste....I meant not using the whole batch. When I filled my 4 10's I have at least a quarter tote of soil if not more. Might as well fill up 15's than having it sit around doing nothing.Nope...not a waste at all.
Ever since starting with Doc's gear i have always done 2 kits in rotation. .suits my needs to always have soil ready for the next grow.
Seems to have and is working out peachy for me.
In a few weeks i will empty out my used 4th run soil from the totes and mix up another 5th run batch to start cooking.
Like to get that new batch cooking two months before i need it.
Cheers Seedling .
Btw....i like your idea of 4, 15's.....cant lose with that method!!!
I need two batches in rotation for things to work smooth.