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<http://schema.org/description>
"Today's episode focuses on filling the tray with limestone gravel. Limestone is an essential part of pool heater equipment. We put limestone in the condensation tray because the heater will create a lot of condensation. It helps condition it and de-acidify the water that comes out. Then it drips out as non-acidic water over onto the ground. Jandy Hi -E2 Heater is the most popular pool heater among pros; the Hi-E2® sets the standard with a proven in-use record of over 20 years of reliable perf..."
<https://www.claropool.com/post/how-to-add-limestone-gravel-to-the-heater>