KBWPG
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15,000 gallon plaster pool, 30 years old with no damages. Below ground with a big pump (I don't know horsepower) single speed, 4 cartridges. Regular (not salt) system. We use this pool for private swim lessons and church fellowships/baptisms etc. In short, we use it a lot and con't have it out of commission. We are in Sacramento CA that is known for its terrible pollen content.