Well, while you are saving your pennies, check into building one. I just opened up an old LifeGuard unit and it is really simple. Essentially just a "reactor" with in and outflow, a UV resistant shield of plastic, and a glass tube that you slide the lamp into. You can buy parts for them too. I have never seen a wiper model taken apart so no idea on how that is done. Have you searched for UV DIY yet?