Fill water must meet drinking water standards according to TSE 11899. Maintaining pH balance is harder with hard water. Important values: Iron max 0.1 mg/L, Manganese max 0.05 mg/L, Ammonium max 2 mg/L, Polyphosphate max 0.005 mg/L.
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Pools are classified as skimmer (surface suction), overflow, and infinity pool. They are also categorized as indoor/outdoor, public/private, and Olympic/standard.