Installation Case 66 : 20 inch Big Blue Whole House Back Wash Water Filtration System Today preparing to install this 20″ big blue outdoor whole house back wash filtration system. Connect to back wash function first. Connect fittings to big blue casing. And tubing connected. 80% installation processing. Finished tubing connect. This is back wash tubing. 20″ big blue pp sediment filter. Installation done. Installation Case 67 : 10 inch Big Blue Whole House Back Wash Water Filtration System Replace Filters Case 59 : Carbon Block Replacement Filter for Brand B Steel Water Filter System