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Expert village guy has a series of videos showing how to build a homemade hydrogen generator or hydrogen car kit. He also explains why you need to use stainless steel for the electrode material in a hydrogen generator. Other materials like aluminum, brass, copper,and steel will corrode and produce nasty biproducts. Stainless steel, nickel alloys, and titanium are some materials that are resistant to the electrolysis process in a catalyst solution like water and baking soda.
I agree with this guy 100 percent on the use of a clear water filter canister for the container. I see all the mason jar containers on youtube and that is certainly the cheapest and most heat resistant container but I have also seen youtube videos of these glass containers exploding. Glass containers scare me. If you are going to use glass make absolutely sure to have a secure bolted connection inside the top of the hho container. No copper wire with crimped connections. They will corrode and eventually arc out and make the hho gas that is in the top of the jar explode. If you are lucky, the hood will be closed when it explodes. If you are unlucky, you will have the hood up and the engine running and you might get injured badly by flying bits of glass.
Anyway back to the clear water filter canister. this probably adds another 25 dollars to the cost of making the hydrogen generator (also called a hho hydrolyzer, hydrogen electrolyzer, hho generator, hho conversion kit, hydrogen gas saver, and a host of other names).
25 dollars is not much when you consider the benefits of using the water filter canister housing. They are made with a threaded lid that already has threaded connections for hho output and a o ring seal that is water tight... All useful features for making a hydrogen generator.
I am planning on making an electrolyzer using a water filter housing and 316L stainless steel wire for the electrode material. I want a generator that is high output but has a low amperage draw and stays cool without having to resort to cooling fans or recirculating pumps.