Headwater Pools & Spas · Printed hydraulics · Gantry Flats & the Numbered Streets · Lic. HP-2277
Your pool turns over every 6.1 hours. Does it?
Turnover: your gallons divided by your flow — the hours one full body of water takes to pass the filter. It decides whether a pool is clean, kind to its sanitizer, or quietly fighting itself, and it is almost never printed anywhere. Headwater prints it — on the quote, the contract and the equipment-pad door: pump curve, filter area, return aim, one page, checkable by anybody.
Every quote carries a turnover line · 214 sheets printed last season · 48% median pump-energy drop after a tune · (555) 013-9016
THE TURNOVER ARGUMENT, SHORT VERSION: a sanitizer can only clean the water that reaches it, and the water only reaches it by moving — gallons ÷ flow = hours per pass. Print the number or you are guessing. No expires-Friday pricing on this or any page.
What we do
What Headwater builds & fixes
New pools, plumbed from the returns backward
Before the shape is pretty, the water has a route: returns placed and aimed to sweep the floor in loops, a filter sized to real gallons, a variable-speed pump chosen off its curve. The turnover figure lands on the quote — typically 2.7 to 3.5 hours — and the same page goes on the equipment-pad door in laminate.
The printed-math retrofit
For the pool that is fine, vaguely, at a cost: we measure gallons, flow and aim, print the before sheet, then re-aim returns by degree, right-size the pump and match the filter. The after sheet goes beside the first. Median pump-energy drop across last season’s retrofits: 48 percent, in writing.
Spas & plunges, taken seriously
A small body of hot water is the hardest hydraulics problem in the yard — jet loops, therapy seating, the heat that refuses to wait. We size spa plumbing the way we size pools: by the math, with a turnover line and a jet-pressure figure you can hold us to.
Why the shop exists
The sheet is the sales pitch
A pool quote moves for one reason: nobody computed the water. Ours starts with the number and builds outward — and if your existing pool already moves well, the sheet says so and we go home. Twenty-nine audits last season ended exactly that way, which is the cheapest hour we sell.
The two-sided sheet
Every tune prints before and after on one page — turnover, pump curve, filter area, return aim. If the numbers did not improve, the visit is free. It has never yet been free.
How a tune runs
The audit, in four moves
Measure
Gallons, flow, pressure, the pump’s curve — the before sheet, printed on site.
Aim
Returns turned by degree until the floor sweeps itself and the skimmer actually skims.
Right-size
The pump matched to the math: slow and long beats big and short, every night of the week.
The after sheet, beside the before, and both laminated to the equipment-pad door.
2025 — 2026, the Flats
Sheets, pinned to water
Six pools from last season — three new builds, three retrofits — each photographed with its turnover line in the caption, because the water and the math should answer together.
Fair questions
Arithmetic, answered
The five every Numbered Streets kitchen reaches once the sheet is on the table. The shop line answers seven to five, Flats time.
Why do I care about turnover if the water looks clear?
Because clear is what water looks like while it is losing. A six-hour pool runs its sanitizer harder, heats less evenly and grows its problems in the corners the current never visits — and it pays for all of it on the power bill every month. The sheet turns “looks fine” into a number you can argue with.
Can you fix a pool another company plumbed?
That is most of our week. Dye finds the dead spots, a degree or two of return aim fixes half of them, the pump usually shrinks a size, and the filter gets matched to gallons it has never actually met. The before-and-after sheet is the whole conversation; you will hold both sides of it.
Will a variable-speed pump actually save money?
Slower water filters better per kilowatt — that is the physics, not a pitch — so a pump that runs long and gentle moves a full body through the filter for less than a big pump sprinting twice a day. The fleet median after a tune is 48 percent off the pump line, and your sheet projects your number from your tariff before you commit.
What if the audit says my pool is already right?
Then the sheet says so, you pay nothing, and we leave the laminate anyway. Twenty-nine audits ended that way last season — a well-plumbed pool is a real thing and we would rather be the shop that found it than the shop that invented work on top of it.
Does this apply to my spa too?
Especially: a spa is the densest water problem in the yard — hot, small, and full of people. Jet loops get their own pressure figures, the heater gets matched to real gallons, and the turnover line on a spa sheet is usually the most dramatic thing we print all week.
The Flats says
Kitchens, after the sheet
The sheet said 6.4 hours and I did not believe it, so I did the arithmetic at the kitchen table with a tape measure and a calculator. They were right to the decimal. Six weeks later the after sheet said 2.8 — and the power bill believed that too, to the tune of sixty-one dollars the first month.
Every builder showed us a render. Headwater showed us a page with our gallons on it and a pump curve, and said the pool would turn over in 2.9 hours — then built the thing and laminated the proof to the equipment door. Two summers in, the water has never once needed rescuing.
They audited our spa, found the jet loop starved at the therapy seat, and fixed it with a fitting and a re-aim. The pressure figure they promised is the pressure I feel, every evening, in the exact shoulder that needed it. It is a strange thing to frame a hydraulic diagram, but here we are.
Two-hour audits across Gantry Flats & the Numbered Streets · (555) 013-9016 · math@headwaterpools.example
Get the sheet for your water
Two hours on site, one page in your hands — before, and after if you want the tune. New builds quote from the same math, and the laminate goes on the pad door either way. math@headwaterpools.example