Underwater filter system

A submersible filter system for immersion in a pool, said system, comprising:

• a frame means;
• a fluid coupling means affixed to said frame means in an upstanding position, said coupling means comprising the downstream end of a conduit for conducting an effluent fluid under pressure to said coupling means;
• a hollow cannister having a bottom nipple means for releasably connecting said nipple means to said coupling means to establish fluid communication therebetween and to fixedly support said cannister in an upright position on said coupling means of said frame means;
• said cannister having a first fluid passage means in alignment with said nipple means for inducting the effluent fluid from said nipple means into said hollow cannister;
• a filter means;
• mounting means for fixedly mounting said filter means within and in spaced apart relation to said cannister,
• said mounting means and said filter means being adapted to divide the interior of said cannister into an inlet chamber and a filtrate chamber;
• said cannister having a second fluid passage means for exhausting filtrate fluid directly from said filtrate chamber into the pool;
• a check valve means mounted in operative association with said first fluid passage means, said check valve means being responsive to the presence or absence of effluent fluid under pressure in the conduit for admitting effluent fluid into said inlet chamber and for preventing backflow of effluent fluid from said inlet chamber to said nipple means,
• whereby when said cannister and said nipple means are uncoupled from said coupling means in the absence of effluent fluid under pressure in the conduit, effluent fluid is confined within said inlet chamber;
• and
• an elongate tool means having cooperating means and adapted at one end for releasable interconnection at a top of said cannister to effect uncoupling of said cannister and nipple means from said coupling means when said tool means is operated at its other end.