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I have an idea for a gizmo that everyone who owns a pool needs. There is not such a device made as far as I can determine.
It's pretty simple. I have one that I made for my own use.
What do I do with it now?
Are the invention companies legit?

The inventors companies are not in your best interest.

If you believe you have a viable product that the public would want and buy. You need to start with a patent. A patent starts at 10K.

If your still in with at least a 10K investment for the patent. Then you move on to manufacturing.Depending on what it is and how it's made, just start piling dollars on for tooling.

All that being said should you move forward there are folks right here that can help.