Related Clues:
- Sign of an untreated pool
- Pool treatment target
- *Birdbath floaters
- Stuff studied on a grade school trip to the pond
- Aquarium owner's bane
- Sargasso Sea floaters
- Chlorophyll plant
- Fish food
- Fish tank buildup
- Pond scum and such
- Bit of aquarium gunk
- Bit of rootless flora
- Pond surface growth
- Potential pond poisoner
- Film bit