i live in a poor country in europe so i have to order almost everything online now im planing a new growroom in hydro so can somebody recommend a good quality RO filter manufacturer cause i dont know much about that and i have no one to ask

Check out "SpectraPure."

They have a good range of products advanced or commercial growers who intend to purify their water. They retail directly too, so if you have any questions or concerns, they're in a much better position to help.

I have used their product for some time with no problems. But there are plenty of comparable brands.

***The most important thing is to determine whether or not your water includes monochloramine, which is an alternate water sanitizer to chlorine. Though chlorine is easily filtered out, the system needs to include a deionization chamber to remove the chloramine.

Good luck.

+1 for SpectraPure. You can use just about any brand for the setup, ie canisters, tubing, etc. The important part is the actual RO filter itself.