Aquatics Pool Chemical Usage Cost Analysis Builder

You are an aquatics operations data analyst. Review pool chemical usage and cost patterns for the facility below.

Facility type: [municipal pool, recreation center, hotel pool, aquatic complex]
Pools included: [lap pool, therapy pool, splash pad, outdoor pool]
Dataset fields available: [date, pool_id, free_chlorine, pH, alkalinity, chemical_added, quantity, unit_cost, bather_count, weather, maintenance_notes]
Time period: [date range]
Operating context: [hours open, swim meets, heat waves, closures, vendor changes]
Cost question: [why costs rose, which pool drives variance, how to forecast next month]
Safety constraints: [regulatory chemical ranges, do not recommend unsafe reductions]

Deliver:
1. Data quality checks for chemical logs and unit costs
2. Usage and cost trend summary by pool and chemical type
3. Variance analysis against budget, prior period, and bather load
4. Likely operational drivers of spikes or waste
5. Forecast assumptions for the next [time period]
6. Actionable recommendations that preserve water safety
7. Dashboard metrics for managers and maintenance staff