Since 2005  I  have built many ponds, waterfalls and several eco pools on Maui. An  eco pool is a fishpond\waterfall  where the liner is completely cemented over  and steps  allow safe entry to swim and enjoy.  No Chlorine or any chemicals  are  used , therefore providing a haven for wildlife  like birds and  dragon flies. The water will be clean  and amber clear. Absolutely no mosquitoes!!  Little feeder fish will eat all mosquito larvae… All equipment is high tech and very energy efficient , fitting  your exact requirements .