- parts per million
- unit of measurement used in chemical application; it indicates the amount, by weight of a chemical, in relation to one million parts by weight of water (examples
- Pools & Spas
- Equipment & Systems
Strictly Necessary Cookie should be enabled at all times so that we can save your preferences for cookie settings.
If you disable this cookie, we will not be able to save your preferences. This means that every time you visit this website you will need to enable or disable cookies again.