Gaia Green All Purpose 4-4-4 20 Kg

When kept in a cool and dry atmosphere how long is the shelf life on this product? I want to buy in bulk for long term use/cost savings.

What should my water ph level be, while using this product?

how long does it last and which gaia products will i need for all stages of life for growing weed?

Why is it so expensive? I get it that it’s a great product but, $130 Really? I would love to use your product but that price needs to come way down.