Sigfish Chlorinating Fish Chlorine Dispenser Koi. This system is designed to dispense chlorine tablets underwater and float when tablets are dissolved. The Sigfish Chlorinating Fish Chlorine Dispenser allows water to flow in through the nose, then passes over the chlorine tablets dissolving in small amounts and exits through 8 holes at the rear. A bobber suspends the fish showing the submerged location tethered by a 12" monofilament line. This Bass Fish is 18" and hold up to 4 - 3" tablets.