Silica Test KitSilica Test Kits are commonly used to check Silica levels in boiler water to ensure the silica does not plat out within the boilers. This Silica Test Kit is 1 drop = 1 ppm. Silica will decrease your over boiler efficiency. Always maintain a 3:1 total alkalinity to silica ration in pressurized boilers. This will minimize the chance of silica plating.