Any thoughts on solving the following issue?
I have a Saltmate pool chlorinator. For those who don't know, the operation, as I understand it, is that two plates are immersed in a salt solution (the pool water). Current is passed through across the plates, releasing chlorine into solution. Problem is the plates end up white crap on them, requiring immersion in acid to clean. The white crap only adheres to one of the plates. According to the back panel, maximum current is 20 Amps at 6 Volts DC. The current is controlled by a couple of Op amps, a pot and some other stuff, which drives the gates of two, parallelled 65 Amp SCRs.
I spoke to a mate who sells pools and he informed me that the latest models employ a polarity reversing scheme, which virtually eliminates white crap build-up. I like that idea.
Anyway, after a little thought, I figure on adding a couple of relays. One to switch the DC output and one to switch the mains. A 555 timer will switch the mains off, first, then switch the DC relay, to prevent any contact welding issues. Switching frequency will be once every 30 mins or so.
Any suggestions for a better system will be gratefully received.