chlorine automation

Has anyone used this controller? I've read a great deal about the stenner pump setups here, but have been looking for a controller along the lines of what we use on our commercial cooling towers, where we measure and dose similarly to a pool's requirements...

Okay, so I've decided to bite the bullet and go with a stenner pump for chlorine dosage "automation". I was going to go down the "budget alternative route" but came to a conclusion that there wasn't much that seemed reliable in the budget options (and I'd prefer to have this a "once and done"...