I have been in recent e-mail communication with RO Man regarding a pump for RO production. They have one for sale on their e-bay site, but it isnt suitable for continual use, its intended for aquarium hobbyists; however they are out of stock of those they'd suggest are better suited for window-cleaners (round the clock use). When they are back in stock they'll be posted on this page http://www.ro-man.com/shop/index.php/cPath/28