Question
Our pond is small, yet large enough to clean up and have it as a swimming pond for our kids.  However, it has not been maintained in quite a few years.  It is unlined, and has a lot of "stuff" growing up from the bottom.  We have no filter option, it appears to just be a standing water pond.  How can I clean this up and make it nice enough for us to use to swim this summer?  I don't know where to start!

Answer

pipeless Any water exposed to sun will become green and black in course of the time.
hence we require filtration and sanitization since there are no inlets or outlets traditional system in out of question.
And without filtration and sanitization no pool should be used since lots states requires it.
Hence I suggest you go for pipeless filters which are hung on the wall.
The picture I am attaching.