There was an earlier post where we had discussed this automatic chlorinator made by Ezpool, http://www.ezpool.com/
I've had mine for just under a month now and it works great. I fill it with chlorine whenever it runs out and the pool stays at 4-7PPM chlorine all the time. My pool has alway been very clear since I switched to bleach but it is actually clearer now than it was when I was manually adding bleach. I suppose it might be because the Liquidator is more consistent that I was. Also it is surprising the amount of sediment that comes out of the bleach and settles on the bottom of the container.