rather than installing a security system, you can do other things to help keep your family safe. installing a fence, or adding safety locks to your door, are among the many options available to you to consider. use the tips in this article to increase the security of your home. pump outlet to filter inlet attach third hose from filter outlet to pool return. step 23 your new pool sand filter should now be ready to operate. the "out" hole should have a cover on it and the "in" hole won't. not helpful 2 helpful 8. 