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Question:

What are the necessities of a door alarm?

I'm making a door alarm, what MUST it have?I already have; low cost, easy to use, brightly colored/visible, not too small or big (to act as a deterrent)can you suggest some more please?

Answer:

if the green is ONLY on the copper pipes, its oxidation and no worries.if its elsewhere, it could be mold and thats dangerous! use bleach to kill it.
hi,I shower since few years on solar energy in the summer. you could do the same with a black garden hose insulated with plastic bottles on it. the plastic bottles are drilled in the bottom and all looks like a string of saussiges. the water get incredibly warm in the summer,I use it from march to november at my location. good luck!
It sounds like it's just the copper of the pipes oxidizing. You know how the Statue of Liberty is green? It's made out of copper. Nothing to worry about.

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