Oh forgot to say that I do not take my Porvari or my HDV glass tanks out of the house because I do not want to loose them or break something, I have too much invested. So I always grab a Twist and a polypro tank or polypro clearo, to go out and about. That is another reason I love the Twists they are just so darn portable and polypro tank is pretty cheap and light too. Not as good as my Provari and glass tank, but a good back up set up. bnrk