Liquid-treating method

A method for treating liquid in a plumbing system, comprising the steps:

• providing apparatus including a base, an adapter, a strainer member, and a cap member, said base and adapter being constructed for disengageable assembly with one another to cooperatively define a system flushing chamber;
• said base and said adapter each including an interior wall structure having a mouth portion thereon, said mouth portions of said interior wall structures confronting and engaging one another so that said interior wall structures cooperate with one another to define, within said flushing chamber, an inner compartment and an outer compartment, said base having outlet-defining means, in liquid flow communication with said inner compartment through said interior wall structure of said base, and inlet-defining means in liquid flow communication with said outer compartment, and said adapter having inlet-defining means establishing liquid flow communication only between said inner compartment and the exterior of said assembly, said base inlet-defining means being in flow communication with said base outlet-defining means across said mouth portion of said interior wall structure of said base in the absence of said adapter;
• whereby, in said base and adapter assembly a liquid flow path is established from said adapter inlet-defining means to said base outlet-defining means through said inner compartment, and flow is blocked through said base inlet defining means;
• said strainer member being constructed to seat over said mouth portion of said interior wall structure of said base, and said cap member being constructed for disengagable assembly with said base to enclose said strainer member, so seated, and to define cooperatively with said base a filtering chamber;
• installing said base in a plumbing system with said base inlet-defining means connected to receive liquid to be treated and said base outlet-defining means connected to discharge treated liquid;
• seating said strainer member over said mouth portion of said interior wall structure of said base, and assembling said cap member with said base to configure said apparatus for filtering and to cooperatively define said filtering chamber;
• introducing liquid to be treated into said base inlet-defining means while withdrawing liquid from said base outlet-defining means, said liquid passing sequentially from said base inlet-defining means into said outer compartment, through said strainer member, into said inner compartment, and through said base outlet-defining means;
• removing said cap member and strainer member from said base, and assembling said adapter with said base to configure said apparatus for flushing of said system and to cooperatively define said flushing chamber;
• and
• introducing a treating liquid into said adapter inlet-defining means for passage into said plumbing system sequentially through said inner compartment and said base outlet-defining means.