Abstract: A portable, hand-held instrument is provided for capturing a predetermined volume of water to be tested and transferring a measured quantity of reagent into the water for making a visual test of a water condition. A slide is included which has a measuring chamber having a size defining a predetermined volume of reagent. This slide is shiftable from a loading position in which water may be introduced into a mixing chamber and reagent from a supply chamber fills the measuring chamber, to a mixing position where the measuring chamber is isolated from the reagent supply chamber but is in communication with the mixing chamber for mixing the reagent with the water sample. Ports existing in the side of the instrument allow for the introduction of the sample water. Doors are attached to the slide which leave these ports uncovered when the slide is in the loading position and which cover them when in the mixing position.

Abstract: The disclosure concerns a swimming pool-type filter comprising: (a) a stainless steel vertical cylindrical vessel with a removable domed cover and a horizontal partition sealed between the periphery of the cover and the open vessel, from which partition suspends a plurality of filter cartridges; and (b) a helically coiled heat exchanger coaxial of the vertical axis of the vessel and having its horizontal inlet and outlet ducts extending through the side of the vessel and supporting the coil. The filter cartridges fit inside and around the outside of the helical coil for easy removal, replacement and cleaning by lifting the partition after the cover has been removed. The inlet and outlet ducts for the liquid or water to be filtered and warmed are in the bottom of the vessel, with the outlet duct extending up through the vessel to the chamber above the partition in the domed cover.