Thanks for the replies, I'm currently using two kiddy pools that I clean out every day or so but my goal for this spring is to dig a round pond, about 8-10 feet diameter and about 3 foot deep, should be in and around 5000L, I was going to have the pump about 3000l/h pumping the water into 3-4 barrels of gravel,
The barrels will have in them gravel and worms (they will come, couldn't stop them if I tried but Dont want to its great they will be there) which should look after the physical dirt,
But there will also be bacteria in the barrels, this bacteria will turn the ammonia into nitrates and then a second type of bacteria will turn the nitrates into nitrites, nitrites is great feed for plants
so I will have duck weed growing in the barrels, do overall I'm hoping the pong and barrel filter will not only keep the pond clean but also feed the ducks,
So basically that is why I need to make sure the pump will carry small solids, ;-)