I have to admit that I have not usually worn any protective clothing when I perform in-pond maintenance. However, recently a Pond contractor friend of mine contracted Mycobacterium Marinum. A particular nasty pathogen. Took several weeks and several different antibiotic regimes to cure it. In fairness, this critter is only found in ponds with fish, not a swim pond. But if you have open sores such as scratches, cuts or abrasions, you can be easily infected by other organisms. In a total immersion scenario, one is bound to ingest some of the water, which could easily lead to internal problems. Children especially, their immune system is not that strong.
I will have to re-evaluate how I do things, breaking some old habits.
"Everybody is ignorant, only on different subjects." - Will Rogers