Equipment & Hydraulics
The time required for the entire pool volume to pass through the filtration system once. Illinois IDPH sets maximum turnover times by facility type.
Turnover rate is how long your filter takes to process one pool's worth of water. Semi-public pools in Illinois typically require a 6-hour turnover; wading pools and splash pads require 1-hour turnover. The calculation is (pool volume in gallons) ÷ (flow rate in gallons per minute) ÷ 60 = turnover in hours. Undersized pumps, clogged filters, or hydraulic design flaws can silently push turnover past code. Inspectors ask to see turnover math for every permitted pool.
Faster turnover isn't always better — oversized pumps can stress plumbing and increase energy costs.
A pool that `looks clear` can still fail turnover-rate math.
Replacing a pump without re-verifying turnover is a common contractor error. Flow rate changes mean new math.
Where this shows up at Aqua-Guard
Relevant services our team runs every week:
Related terms · Equipment & Hydraulics
Saltwater Chlorine Generator (SWCG / Salt Chlorinator)
An in-line device that generates chlorine electrolytically from dissolved pool salt, replacing or supplementing tablet / liquid chlorine dosing.
Variable-Speed Pool Pump (VFD Pump)
A pool pump with an electronically controlled motor that runs at varying RPMs to match demand. Typically cuts energy use 50–75% vs single-speed pumps.
Aqua-Guard runs certified commercial pool operations for 200+ Chicagoland HOAs, condos, and clubs. We handle the credentials so your board doesn't have to.
Request a Written Proposal