The jets that I started with [the ones in the pic above] came from HomeDepot. The second set I got came from a local hydro store. They are sold as replacement jets for one of the big name clone machines they sell.
Go online or local shop and get replacement jets for a name brand clone machine.
If you can look at the jet, the ones at HomeDepot have slots cut around the top. The ones I replaced them with are open on both sides with a part in the middle that causes the water to spray up and out.
Note: they also have 360/180 deg sprayers, it's probably best to just get the 360 ones. Also the ones towards the middle are important, they cover most of the area, so you can have a few extra in the middle.
One other thing you can do is to offset the sprayers, instead of having all of them straight, you can angle a few to spray towards the corners. I noticed more spray in the middle than the corners, so I might add a few extras pointing to the corners.
Go online or local shop and get replacement jets for a name brand clone machine.
If you can look at the jet, the ones at HomeDepot have slots cut around the top. The ones I replaced them with are open on both sides with a part in the middle that causes the water to spray up and out.
Note: they also have 360/180 deg sprayers, it's probably best to just get the 360 ones. Also the ones towards the middle are important, they cover most of the area, so you can have a few extra in the middle.
One other thing you can do is to offset the sprayers, instead of having all of them straight, you can angle a few to spray towards the corners. I noticed more spray in the middle than the corners, so I might add a few extras pointing to the corners.