<https://www.aquameds.com/blogs/news/should-i-power-wash-my-koi-pond-and-filter-every-year>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.aquameds.com/blogs/news/should-i-power-wash-my-koi-pond-and-filter-every-year>