Air conditioning drain treatment apparatus

An automatic, non-mechanical apparatus for treating drain water in air conditioning and refrigeration system condensate drain lines, said apparatus comprising:

• a body portion having a central cavity with an inlet and outlet interposed in a condensate drain line carrying drain water, an upwardly extending neck portion, and a downwardly-depending reservoir extending below said inlet and outlet;
• a cartridge including a shell positioned in said downwardly-depending reservoir, said shell having a plurality of openings, a plurality of stand-offs extending radially outward from said openings to center said shell and said openings in said downwardly-depending reservoir and below said inlet and outlet, and containing a quantity of biocide, and an upwardly-extending shaft positioning said cartridge in said body portion, wherein said stand-offs facilitate passage of drain water in the drain line into said shell through said openings in said shell to release biocide into the drain water in the drain line to prevent algae growth, and said cartridge is substantially non-moving during operation.