30 October 2012, 22:42
look up blast valves you are going to need these 2 .......1 on inlet and 1 on outlet , you need to be underground with 5ft of earth over the top...... or bank up the earth around the house ... blast valves are for the shock waves and after suction they seal in or out automatically...... if its a bio kiss your arse goodbye ....unless you have the RIGHT filtration system .... 2k s worth