Unit is ready to go upon arrival and includes a Stainless Steel input hose, Pressure Regulator (use if you are unsure if your feed pressure is below 70 psi), quick disconnects for the input/output hoses, wheels and foldable handle. No need for a TDS meter- the filter on right side changes color when expired! Simply remove the Double Chuck from the box, attach the pressure regulator to your hose spigot (IMPORTANT: system has a 70 psi pressure limit and you must use regulator if you don’t know your supply pressure. System performance is not reduced by use of supplied pressure regulator), attach the included stainless steel line to your spigot or pressure regulator then attach your garden hose (or pressure washer!) to the output side and wash to your heart’s content! Stop system use when the bottom two colored panels turn from blue to gold. Double Chuck should be stored away from direct sunlight as this could overheat the filter media and reduce the life of the filters. Of course, you could use the unit all day in the sun w/o worry but please keep your Double Chuck away from storage in direct sunlight. Simple Chuck’s Double Chuck is 23″ tall x 10.25″ deep x 16.5″ wide. Simple Chuck replacement cartridges are available for $144.95 and ordering is, well, simple. When you want a fresh set, you purchase by phone or online and a fresh set will arrive in 2-7 days (locale dependent). Simply drop the expired cartridges in the shipping container, attach the prepaid label, and give ’em to your favorite FedEx driver! Best said by one of our *spotless* family members: “Received the wash system mid day today and a huge THANK YOU for expediting it to me. I just finished washing the coach and it blew me away just how spotless it is."