Quote Originally Posted by smokesalot
plant death at 5000 ppm
That is what I thought but I was proved wrong. There is a point where the plant just can't absorbe the extra amount of CO² and it goes to waste.

I ran over 5000 ppm for over 2 weeks trying to kill off spider mites and it did not work. It did slow them and I could kill them with other methoids but it did not kill them or the plants. I have read levels over 25000 pmm can kill the plants by turning the air to poision and then the oxygen they produce is over powered by the CO². The roots need oxygen but the leaf does not it produces oxygen as a by-product.

Just thought I would clear this up for everyone.