This product is very nice quality, made well, nice size and arranged well for ease of organization filling and removal. We did level the ground apply sand then cement squares and lastly  ground cloth before place the unit on a raised area outside our
large shed. Very pleased with this purchase!! Thank you Wayfair. I will say Fed Ex didn't do the best in shipment as all three of the large boxes we received had large tears in them and one a really large cavity with 3 long tears. Someone needs to have a conversation with them!!