Hanna HC - HI736 - Marine Phosphorus Ultra Low Range Checker® Fragging Equipment The mechanical prefilter box is

The mechanical prefilter box is a purpose built compartment capable of receiving large volumes of water and dispersing efficiently and quietly over a rain tray that delivers a constant stream of water to the mechanical filter tray below that the aquarist can fill with filter pads or similar

Held in place by strong rare earth magnets for use on tanks up to 5/8" (16mm) tank wall thickness

Phosphate Solution will remove phosphates from aquarium water

The low-profile wet side and strong neodymium magnets let you scrub or scrape away tough algae buildup — without ever putting your hands in the water

Hanna HC - HI736 - Marine Phosphorus Ultra Low Range Checker® Fragging Equipment The mechanical prefilter box isThe Hanna Phosphorus Ultra Low Range (0 to 200 ppb) Checker bridges the gap between simple chemical test kits and professional instrumentation. Chemical test kits have limited accuracy and resolution since they rely upon the human eye to discern differences in color. Professional instrumentation incorporates a light source such as an LED or tungsten lamp with a filter and a light sensing detector to precisely determine ion concentration. Professional