iandh's KillCoils are approx. 1.3g of pure anti-algae/antimicrobial ass kickery in the form of 0.999 fine silver!  The tightly wound helical shape (about 11.4mm OD) lends itself to easy insertion into tubing and many reservoirs while, at the same time, being just large enough to prevent passing through fittings and into your cooling components.

By placing silver into your loop your algae days are over! Use the name you know and trust..... KillCoils!