Several factors can contribute to foaming in pools:
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Soft water; low calcium hardness levels.
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High TDS levels.
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Lotions, oils and animal fats in the water.
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Poor water balance.
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Low grade algaecides. 10% polymers.
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Tile cleaning phosphates.
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Use of aeration (air jets) in biguanide treated pools.
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Practical jokers with a box of soap!
Correcting the above conditions can reduce or eliminate foaming. Anti-foaming agents are available.
Chitin products like Sea-Klear can prevent or eliminate foaming from occurring. The Natural Chemistry line of enzyme products are also very effective anti-foam agents. Sometimes balancing the water and "shocking" the pool can remove the foaming.
