The disclosed technology includes pre-filter system that can include a filter portion comprising pipes, elbows, and tees. The pipes can include apertures. The pipes, elbows, and tees can be positioned such that a first end of a first group of neighboring pipes can be fluidly connected to form a column of fluid connection and a second end of a second group of neighboring pipes can be fluidly connected to form a row of fluid connection. The apertures of at least some of the pipes can be covered with a mesh netting. The pre-filter system can include an airtight float portion. The float portion can be attached to the filter portion to provide a predetermined amount of buoyancy to the pre-filter system.

A skimmer basket assembly has an basket, a circular platform with a magnetically permeable ring supported on a spring, a guide tube having a lowermost end of the guide tube positioned above an uppermost position of the circular platform, and a flag assembly within the guide tube, the flag assembly having a central stem, a flag at an uppermost end, a magnetic tip at a lowermost end, and a float. With the skimmer basket in a housing, with water flowing through, and the circular platform at an uppermost position, the flag assembly is held to the ring, and, with debris collected in the basket, increased force compresses the spring, separating the flag assembly, allowing the flag mechanism to float upward as an alert that there is debris in the skimmer basket.

An air vent hole includes a substantially columnar hole main body portion, a first hole portion formed on the upper side of the hole main body portion, and a second hole portion formed on the lower side of the hole main body portion. Each of the first hole portion and the second hole portion partly has, in a cross section of the hole portion substantially orthogonal to a first direction that is a longitudinal direction of the hole main body portion, a cross-sectional area smaller than a cross-sectional area of a cross section of the hole main body portion substantially orthogonal to the first direction. A float inserted into the air vent hole is movable between a position where the float occludes the first hole portion and a position where the float occludes the second hole portion. The float occludes the first hole portion under the weight of the float. However, the float is pushed up by air. Furthermore, the float is formed of a material having a smaller specific gravity than a liquid to be filtered. Thus, the float is pushed up by the liquid to occlude the first hole portion.

A floating liquid intake for a liquid suction removal system, the liquid intake comprising housing defining an internal cavity. The housing has a hollow and buoyant annular body, an upper cover and a lower cover. The internal cavity is formed between the upper and lower covers. A substantially annular inlet is formed in the annular body for ingress of liquid into the cavity. The annular body has a buoyancy sufficient for the liquid intake to float in a liquid with the annular inlet submerged below the surface of the liquid in which the liquid intake is floating. A pipe extends into the cavity and the pipe includes an inlet that in use is open below the surface of the liquid within the cavity. The pipe extends outside of the cavity for connection to a liquid suction removal system.

A tank for storing oil includes a suction strainer with first and second filtration portions. The first filtration portion has a substantially cylindrical shape and formed by bending a thin plate into a pleated shape. The second filtration portion is provided on the outer side of the first filtration portion. The second filtration portion has a substantially cylindrical shape and is formed of a material having a plurality of spaces formed in a surface and interior of the material.

A skimmer basket assembly has an basket, a circular platform with a magnetically permeable ring supported on a spring, a guide tube having a lowermost end of the guide tube positioned above an uppermost position of the circular platform, and a flag assembly within the guide tube, the flag assembly having a central stem, a flag at an uppermost end, a magnetic tip at a lowermost end, and a float. With the skimmer basket in a housing, with water flowing through, and the circular platform at an uppermost position, the flag assembly is held to the ring, and, with debris collected in the basket, increased force compresses the spring, separating the flag assembly, allowing the flag mechanism to float upward as an alert that there is debris in the skimmer basket.

Filter systems disclosed herein collapse for storage purposes and include mechanisms to continuously fill an upper chamber, allowing it to be smaller and to include more filters. A UVC light in a lower chamber sanitizes water entering therein. Water entering the lower chamber may pass through a quartz tube near the UVC light for sufficient exposure. The UVC light may be cycled between shorter periods of higher intensity and longer periods of lower intensity. A low power source such as a small solar array and/or battery may power the UVC light. A proximity switch may control the UVC light by providing power to the light only when the upper chamber is engaged with the lower chamber which may protect the user from exposure to the UVC light. Sealing mechanisms between the upper and lower chambers, as well as tote mechanisms and an alternative bucket filter system are disclosed.

An inner case being substantially cylindrical and being covered at an upper end is provided to cover a heater being substantially rod-shaped. A float being substantially plate-shaped and having substantially the same inner diameter as an inner diameter of the inner case is provided movably in the vertical direction in the inner case, and in the float, a hole through which the heater is inserted is formed. Gas is enclosed in a space surrounded by the inner case and the float. The length in the vertical direction of the inner case is smaller than the length in the vertical direction of the heater. In addition, when the float is positioned at a lower end of the inner case, a gap exists between the float and a bottom surface of a filter case.

A fluid drain off system for a fuel filter, the system comprising a float, movable together with a trigger device for a switch, such as a magnet, in response to the level of fluid contaminant, a switch arranged to be selectively triggered by the trigger device upon the fluid contaminant reaching a predetermined level, and a fluid passage configured to be selectively opened in response to the triggering of the switch to allow fluid contaminants to be drained from the filter.

Devices and methods associated therewith for facilitating movement, removal and/or installation of components from treatment units (e.g., water treatment units and wastewater treatment units). The treatment unit can take the form of a granular media filter (e.g., upflow filter, downflow filter or bi-flow filter) or a sludge collection basin. One preferred device is one or more floats facilitating safe removal of components of a treatment unit. The float(s) can be operably associated with an air scour system of a water filter to remove the air scour system from a granular media filter bed. The float(s) can be operably associated with a collection grid of a sludge collection container facilitating safe removal of the collection grid from the sludge collection container. Another preferred device is a flexible piping/conduit operably connected to a pressurized air source and an air scour system to assist in removal/installation of the air scour system.