Wood-My pond is 3/4 acre and just had its first birthday. I have a liner with a top soil bottom. I stocked it according to my supplier and put in a bottom diffuser before adding fish. I started seeing fish gasping for air in July and lost a good deal of them. I called mu supplier and he said that i needed a Kasco areator and put one in and the problem disappeared. Somewhere on this forum a fella that raises trout listed the benefits of both systems. I recall that the bottom diffusers supply 10% o2 and the splashers are at 50%. Cecil may recall the post where this trout farm owner specifically said he uses Splashers, its here somewhere under Trout i believe. I also add 40 gal/minute non aerated well water to the pond in July and part fo august to keep temps low. The splasher only runs at night and on cloudy days. I run my diffuser Sept-May 12 hours a day at night and it does keep a nice area open to keep ice off. If you do no have a system to aerate i would get one in ASAP or sooner or later you will have a fish kill. Also watch your temps if they get close to 75 the trout will really stress. My trout will die at 78 and the ones that don't will have problems later. Anyone who has other comments and the pros please help out if you can add to this post.

jd