Holding Tank Woes

My contents sender stopped working a few weeks ago. It is a SS tube with a float inside. The float had got stuck at the bottom. Took it out, cleaned it in a bucket and put hose jet in the holes until the float worked again. Not a pleasant job.

The problem as I see it was that I always tried to leave the tank empty so that meant the float at the bottom of the tube was perhaps resting in the inevitable sludge at the bottom of the tank. So now I am going to leave it say a third full so the float is floating in liquid.
 
Chalker - My holding tank is, unfortunately, integral to the keel. Any sender attached outside the tank would have to be outside the boat.

Billba - I'll take a look at the product; thanks for the tip!

MoodySabre - Ugh. I'm aiming for something without moving parts to avoid this very problem. This is a job I only want to do one time!!
 
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