I have a concrete and rebar slab in my back yard that I'd like to build a pond on. Unfortunately at 6ft x 7ft x 4ft tall the water weight will be 10,500lbs of pressure. It doesn't have to be pretty, so I'm considering four walls of concrete and rebar filled cinderblocks masoned together by a...

The 5/8" (outer diameter) copper pipe that supplies my washing machine runs along an unfinished basement wall made of some type of old concrete block (built in 1930s; blocks are about 1' square by about 3" thick, and are sort of "ribbed," and painted white). The hot water pipe is sagging in one...