A black tank sewer flush adapter comprises a tubular body, a boss connector connected to or integrally formed to the tubular body, a flexible sealing washer, and a fastener. The fastener is for forming an attachment with the distal end of the boss connector while the water hose passes longitudinally through at least all the opening of the fastener, the opening of the flexible sealing washer, and the distal end opening of the boss connector. By allowing the water stream emitting end of the water hose to pass through the boss connector and the proximal end of the adapter and into a black tank, the water stream can be applied directly to the interior surfaces of the black tank and a net increase in dislodging adhered sludge from the interior surfaces of the black tank is observed.

Systems and methods for cleaning a photobioreactor apparatus are described. Cleaning devices are described that include flexible members coupled to a propulsion member. The cleaning devices may be moved through tubes of the photobioreactor apparatus using the propulsion member. As the cleaning devices move, the flexible members may make contact with walls of the tubes, thereby cleaning the walls of the tubes. Cleaning devices are also contemplated that include particles with some rigidity that intermix with the fluid inside the tubes and clean the walls of the tubes as the particles contact the walls.

Systems and methods for cleaning a photobioreactor apparatus are described. Cleaning devices are described that include flexible members coupled to a propulsion member. The cleaning devices may be moved through tubes of the photobioreactor apparatus using the propulsion member. As the cleaning devices move, the flexible members may make contact with walls of the tubes, thereby cleaning the walls of the tubes. Cleaning devices are also contemplated that include particles with some rigidity that intermix with the fluid inside the tubes and clean the walls of the tubes as the particles contact the walls.

A pipe fitting includes an entry hub, an exit hub, and a cleanout hub. The cleanout hub is coaxially aligned with the exit hub and angularly offset from the entry hub. The pipe fitting also includes a main body that extends between the cleanout hub and the exit hub. The main body defines a main body length that is at least three times greater than the exit hub outer diameter.

A pipe fitting includes an entry hub, an exit hub, and a cleanout hub. The cleanout hub is coaxially aligned with the exit hub and angularly offset from the entry hub. The pipe fitting also includes a main body that extends between the cleanout hub and the exit hub. The main body defines a main body length that is at least three times greater than the exit hub outer diameter.

A magnetic duct access door provides for frequent access to a variety of different kinds of duct. The access door allows for an efficient magnetic attraction to a metallic duct and easy manual removal of the access door by tilting the access door via handles on its front surface. The access door includes: an access door base; a plurality of magnets arranged around the periphery of the back surface of the access door base; a compressible sealing member located between the magnetic attachment pads on the back surface of the access door base; at least one handle portion extending from the front surface of the access door base.

A magnetic duct access door provides for frequent access to a variety of different kinds of duct. The access door allows for an efficient magnetic attraction to a metallic duct and easy manual removal of the access door by tilting the access door via handles on its front surface. The access door includes: an access door base; a plurality of magnets arranged around the periphery of the back surface of the access door base; a compressible sealing member located between the magnetic attachment pads on the back surface of the access door base; at least one handle portion extending from the front surface of the access door base.

A pipe washing and drying system includes a ring structure defining a radially inner surface and a radially outer surface, the ring structure having a first portion and a second portion hingedly coupled to the first portion. The ring structure further comprises nozzles and rollers defined in the radially inner surface and extending radially inward. The pipe washing and drying system may further include a tent structure comprising a frame and a protective covering supported thereby. The tent frame is coupled between two of the ring structures such that the protective covering covers a section of the pipe between the two ring structures.

A pipe washing and drying system includes a ring structure defining a radially inner surface and a radially outer surface, the ring structure having a first portion and a second portion hingedly coupled to the first portion. The ring structure further comprises nozzles and rollers defined in the radially inner surface and extending radially inward. The pipe washing and drying system may further include a tent structure comprising a frame and a protective covering supported thereby. The tent frame is coupled between two of the ring structures such that the protective covering covers a section of the pipe between the two ring structures.

A sewage backup prevention system is disclosed that enables an amount of sewage to exit an opening in a sewer cleanout instead of backing up into a finished portion of a residence or other building. The sewage backup prevention cap has a tapered body, contains no threads and fits loosely around and partially in a branch opening in the sewer cleanout. A backup in the sewer line will cause the sewage backup prevention cap to move upwardly from the branch opening thereby allowing an increasing amount of sewage to exit the sewer line.