A much bigger block with a cavity/hole going through the center.
Regular 4" block with a 90 degree offset.
An empty big bag.
2" clean medium sized stone
A tonne bag of sand.
Drainage stone-small smooth rounded stone
Small empty heavy duty sand bag.
The bigger thicker blocks up from the 4"
Regular 4" block with a 30 degree offset.
Clause 804
Plastering sand
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