Backyard B#*+%

My backyard has suddenly become the "hangout" and like a runaway train I am not sure how to stop it. We have had the pool for over a month now. Last Sunday, before I got home from work, daddy let 2 next door kids play with Espen in the pool. These same kids have played, with a couple others, in the back yard on two other occasions in the last year. They have played with Espen in the side yard where all the houses meet numerous times. On Monday I allowed 2 of them over to play in the pool. It made the pool horribly dirty. It made the new filter work extra hard. It made my job cleaning longer. They are in 6th and 2nd grade. They are not really playing WITH a 3 year old! So Tuesday when we were in the pool, Espen and I, and 3 of them wanted to come over I told a them NO and maybe another day. Espen was not upset because I was playing with him. So we played and it was great fun. Then Tuesday night one of the kids came to the front yard while we were doing yard work and Espen was playing nicely with his trucks. This morning before 8am I was playing with Espen and the trucks and he wanted to bash and smash them into me, each other, the house and the rocks. He called it turbo crashing. Clearly something he learned from the neighbor. So mommy explained why WE don't smash into each other and the trucks. Then this afternoon, we had just gotten home and come in the garage. I was making lunch and the door opened and we heard knock knocks. I answered to find the same kid in his swim shorts with a towel saying "can me and Maria swim with you now?". NO. I was firmly kind to him but made it clear we were eating and not going to swim right away. When we finally did go swim, they were no where in sight. Couple problems...... Not one single time have we seen an adult check on these kids. I may be more apt to let them play if there was some supervision. Or if some one simply said "hey is it ok for my kids to keep playing with your son?". If we are outside already and they peep over the fence I may be more than likely willing to let them play. Some days I will say no but some I won't. But to come to my door every blasted day already ready to swim is driving me nuts. And I will not be likely to say yes ..... And the age difference is so great. If these kids were closer to Espen's age I may be more likely to be eager to have these play dates. But then one would require parent supervision. So I will have to be the backyard bitch. Never thought I'd get to this point but I don't want to watch other kids or add extra cleaning time in my pool. And I frankly enjoy playing with Espen in the pool. So we will see what happens tomorrow and then I am draining it for vacation.