For a Different Reason
When we got our 23.5 in 1993, the curse of the Zebra Muscle, an invasive species, was just becoming known in Lake Erie. Since we trailer our boat between Lake Erie and various smaller inland lakes in Ohio, I was concerned about contributing to the spread of this critter. So, I contacted the people at the Ohio Sea Grant Foundation at Ohio State Univ. They recommended putting 4 ounces of chlorine bleach in the ballast tank on the 23.5, saying that this would be enough to take care of the muscle larvea in the tank, but not enough to do harm to the water life around the boat ramp when the tank was drained.Over an extended period of time (our ballast tank is never full for more than a week), the chlorine will break down and disipate. But I would think that it would be better to add a few ounces every month or so than to dump a larger amount in all at once.Fair Winds,RobS/V Kinship