Hi I have included a hand gesture that symbolses perfectly OK, which in this context also means perfectly clean and working.The portion where the thumb and the index finger meet represents a C and it hold a water droplet symbolizing the water in your pool is taken care of.
In entry #171 i have included the symbol in the wordmark itself. Which symbolises clean water in the pool.
Please let me know if you would like to see any changes to my design. Thank you for your time SreekantG