1. How many square metres does a bulk bag go?
On average a bulk bag will cover approx. 10-12 square metres at 50mm depth

2. How far does a midi bag go?

You typically need 2-3 Bags per Square metre at 50mm depth

3. How deep should I set my posts and how much post mix do you need?

Normally you would set you posts approx. 450mm (18") to 60cm (2ft) in the ground, this will need around 1.5-2 bags of post mix