I took the uv light out of the major fish pond because the water is super clear.  I just have algae on the bottom, which I don't mind for a fish pond.  The swimming pond has algae on the sides and bottom which we clean.  I like just a little bit of free floating micro algae in the water because it helps hide the imperfections of the pool.  It's only about 4 feet deep max.
				
			 
	 
	 
 
		
 
 
		 
 
		









 
 
		