I have had the hammerhead Algae Free magnet for 10 years and the tank side of the cleaner cracked. I looked to by the back online, but I could not so I called them. Not only is their magnet superior, their customer service is top notch. I talked to Mark and he said, "Send me an email and I will send you a new one". That is excellent!!! It is a pricey magnet, but IMO worth EVERY PENNY