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Which grade of pumice for hydro

Hi guys
I am going to set up a flood and drain bucket hydro system for some of my peppers.
Pumice is very cheap here in New Zealand compared  to other mediums and I have two choices,Either 1-4mm or 4-8 mm.
I am leaning towards the larger 4-8 mm as it wont compact as much and will retain more air.
Whats do you guys think?
 
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