what happens is as follows:
The reaction of Aluminium with Sodium Hydroxide is a Displacement reaction (where one element is more reactive than the other and displaces it in a reaction). Therefore, when both react with each other, it would form Aluminium Hydroxide (AlHO) and Sodium (Na).
I have seen the salt crystals and i have seen gray powder on the bottum.
Tektrical, this " system" is a 1 electrode system.
Do you suggest to make a 2 electrode system?
What materials? (of course 1 of aluminium)
Is current not shutting down the reaction?
7kw for 300 usd is really cheap.... Make one run on this. Learn the needed leassons and move to a second one....
I will try here something with filters and a very small aquarium pump....
If i can keep the water clean and the naoh working, then i will try to make my 3,5kwh gen run on it....