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PoolBuff
Portrait of Robert Henry

Robert Henry

Founder

· 15 years in the industry

I spent more than fifteen years working just about every side of this industry. Weekly service routes, testing and dosing other people’s water. Equipment repair and warranty work, which mostly meant turning up to a pool where something expensive had died and working out why. New construction, from the dig through to handing over the keys. And time behind the counter at a pool store, testing samples people brought in.

That last one is why this site exists. You spend a few years watching the same six problems walk through the door, explaining the relationship between cyanuric acid and chlorine to people who have owned a pool for a decade and were never once told about it, and it stops being a chemistry problem. It becomes an information problem.

Almost every expensive thing that happens to a pool is preventable, and the reason it happens anyway is that nobody explained the underlying mechanism to the owner in plain language. Not because the industry is dishonest, but because there is no time to teach someone water chemistry between stops on a route.

PoolBuff is that explanation, written down properly. No upsells, no affiliate-driven verdicts, and no filler before the answer.

Background

  • 15+ years in the pool industry
  • Residential service routes
  • Equipment repair and warranty work
  • Pool construction and installation
  • Pool retail and water testing

Writes about

  • Water chemistry
  • Pumps, filters and heaters
  • Equipment troubleshooting
  • Pool construction

Guides by Robert Henry

136 articles

Steam over a hot tub in evening light, a weak stream and a trail of bubbles leaving one large jet below the waterline, more jets and a pillow on the wall above
Spas & Hot TubsTroubleshooting

Hot Tub Jets Weak or Not Working: What to Check

What the spa makers' manuals say to check when hot tub jets go weak, surge or stop: the water level, filter, pump speed, air controls, valves and airlocks.

9 minUpdated Oct 3, 2026
A round above-ground pool closed for winter in a bare backyard, its dark blue cover domed in the middle, rainwater and oak leaves in the sag, a red cable and winch at the rail
Seasonal CareHow-to

How to Close an Above-Ground Pool for Winter

Which above-ground pools can stay up, how far each maker says to lower the water, and the plugs, pillow and cover that keep winter ice off the wall.

12 minUpdated Oct 2, 2026
A gray sand filter tank on its black stand beside a pool, the valve off and lying on the deck, a scoop of sand resting on the open neck and a white bucket of sand at its base
MaintenanceHow-to

How to Change the Sand in a Pool Filter

When filter sand really needs changing, how much each Hayward, Pentair and Jandy filter takes, and the fill step that protects the laterals underneath.

10 minUpdated Sep 28, 2026
A blue bubble solar cover rolled onto a white reel at the edge of a sunlit pool, pale stone paving in front and a rendered wall with agaves and grasses behind
Water ChemistryHow-to

How to Lower Chlorine in a Pool

Chlorine reading high? Make sure the test isn't lying, stop whatever is feeding it, and let the sun do the work. When a neutralizer is worth using.

10 minUpdated Sep 27, 2026
A pool pump on a concrete pad beside a gray breaker box on a post, its door open and conduit running down to the motor, with a black cartridge filter behind
RepairsTroubleshooting

Pool Pump Won't Turn On? Silent, Humming or Tripping

How a pool pump fails to start tells you where to look. Silent, humming, tripping the breaker or GFCI, or shutting off hot: what each means and what to check.

12 minUpdated Sep 25, 2026
A pool brush on an aluminum pole resting on a gray plaster pool floor, a clean stripe swept through a dusting of fine white powder behind it
RepairsTroubleshooting

DE in the Pool: Why a DE Filter Leaks Powder

A puff after recharging is normal. Powder that keeps coming is often too much DE, not a torn grid. What the makers say, where it gets in, and the fix.

9 minUpdated Sep 18, 2026
A still pool in a walled garden at dusk, an empty wooden lounger with a folded towel in the foreground and climbing greenery on the wall behind
MaintenanceGuide

Pool Care While You're Away

What actually goes wrong while you're gone, how to set the chlorine and the pump before you leave, and when a pool genuinely needs someone to visit.

5 minUpdated Sep 17, 2026
A fan of pale sand grains spread across the speckled white floor of a pool, the lower wall and a line of palms out of focus behind
RepairsTroubleshooting

Sand in the Pool: Why a Sand Filter Blows Sand

A cracked lateral is the usual answer, but not the only one. How to tell filter sand from plaster grit, what the makers' troubleshooting says, and the fix.

9 minUpdated Sep 28, 2026
A white pail of coarse white granules with a clear scoop on concrete coping beside a blue pool, granules spilled on the stone and a lawn behind
Water ChemistryHow-to

How to Raise pH in a Pool

Aeration, soda ash or baking soda: which one your test calls for, how much to add, and why pH below 7.0 takes far more than the rule of thumb says.

6 minUpdated Sep 15, 2026
A newly installed almond pool pump on a concrete equipment pad, plumbed in gray PVC with flexible conduit running to an electrical disconnect box on the wall behind
EquipmentHow-to

How to Replace a Pool Pump

Whether you need a whole pump or just the motor, the port size that catches people out, and the two mistakes that turn a two-hour job into a plumbing repair.

7 minUpdated Sep 14, 2026
A pale lounger standing in a few inches of water on a pool shelf, a folded umbrella and rough stone coping behind it, lawn and treeline beyond
Design & IdeasGuide

Pool Tanning Ledges: Depth, Cost and What to Avoid

Nine to twelve inches is the whole decision. Get the depth wrong and the furniture floats or the water cooks — plus the circulation problem nobody mentions.

6 minUpdated Sep 9, 2026
A tipped paper sack spilling fine white powder onto wet stone coping with a plastic scoop resting in it, pool water beyond
Water ChemistryExplainer

Baking Soda in a Pool: What It Does

It raises alkalinity, not pH — which is why people add it, get the wrong result, and add more. How much to use, and when soda ash is the right product.

5 minUpdated Sep 8, 2026
A cluster of small dark raised spots on a pale submerged step, seen through clear water with a stone retaining wall beyond
Water ChemistryHow-to

Black Algae in a Pool: How to Kill It

It is not algae, it has roots, and it builds a shell over itself. Why chlorine alone never touches it, and the brushing protocol that actually clears it.

5 minUpdated Sep 8, 2026
An open hot tub cabinet panel showing the pump, gray plumbing and unions inside the equipment bay, timber decking beneath
Spas & Hot TubsTroubleshooting

Hot Tub Not Heating: What to Check

What the spa makers' manuals say to check when a hot tub won't heat: settings, power, flow, the high-limit and the cover, and where it stops being your job.

5 minUpdated Oct 1, 2026
A hot tub set into timber decking with its cover folded back and steam lifting off still water, a pool and coastal grasses beyond
Spas & Hot TubsExplainer

Hot Tub Rash: Why It Happens

It is a water problem before it is a skin problem. What lets the bacteria survive a hot tub, and the sanitizer habits that stop it recurring.

5 minUpdated Sep 8, 2026
A capped test vial of pale pink pool water standing on wet dark stone coping, a rectangular pool and fenced pasture behind it
Water ChemistryExplainer

How Long After Shocking a Pool Can You Swim?

The honest answer is not a number of hours. It is a chlorine reading — and knowing which one saves you a day of waiting or an evening of stinging eyes.

6 minUpdated Sep 8, 2026
A graduated measuring jug of clear liquid and a white chemical jug standing on pool coping, desert planting and a stucco wall behind
Water ChemistryHow-to

How to Lower pH in a Pool

Muriatic acid or dry acid, how much to add, and why the pH you keep chasing back down is usually an alkalinity problem wearing a disguise.

5 minUpdated Sep 13, 2026
A hard white calcium crust banded along pool waterline tile, the deposit rough and uneven where it meets clear water
Water ChemistryExplainer

Calcium Hardness: The Number That Only Goes Up

Too low and the water eats your plaster. Too high and it scales everything. Targets by surface, how to raise it, and why lowering it means draining.

5 minUpdated Sep 6, 2026
A garden hose feeding a pool through a clear inline cartridge housing clamped to the coping, water running
Water ChemistryGuide

Filling a Pool With Well Water: Metals and Stains

Iron, copper and manganese ride in on the fill water and stain the pool the moment you chlorinate. How to test first, and what a sequestrant cannot do.

5 minUpdated Sep 6, 2026
A pool with a thin sheet of ice spreading in from the edges across part of its surface
Seasonal CareHow-to

Hard Freeze Coming? Protecting an Open Pool

Moving water is the whole strategy, right up until the power fails. What to do while the pump runs, and what to do the moment it stops.

5 minUpdated Sep 6, 2026
A hot tub filter cartridge lifted out beside an open hot tub cabinet
Spas & Hot TubsChecklist

Hot Tub Maintenance Schedule: Weekly and Monthly

What a hot tub needs after each soak, each week and each month, by the spa makers' own manuals, and the dissolved-solids test that says when to drain.

6 minUpdated Oct 1, 2026
Bromine granules and a used test strip resting on the flat acrylic edge of a cabinet hot tub
Spas & Hot TubsGuide

Hot Tub Water Chemistry: Targets and Sanitizers

Bromine versus chlorine in a spa, the target ranges that differ from a pool, and why 400 gallons at 102 degrees is a completely different problem.

8 minUpdated Oct 1, 2026
Patio furniture stacked and lashed against a house wall beside a pool, the sky heavy and gray, palm fronds bending in one direction
Seasonal CareGuide

Hurricane Pool Preparation: Before and After

Do not drain the pool, do not put the furniture in it, and do not cover it. The short list that protects your surface and your equipment before a storm.

5 minUpdated Sep 6, 2026
An above-ground pool with its winter cover half pulled back off the top rail, wet leaves pooled in the slack of the cover
Seasonal CareHow-to

Opening an Above-Ground Pool: What's Different

No main drain, a wall that moved over winter and a fraction of the volume. The opening steps that change on an above-ground, and the two that matter most.

5 minUpdated Sep 6, 2026
A row of plain chemical containers on a shed shelf, one bucket among them visibly swollen and bulging at the sides, its lid domed upward
SafetyGuide

Pool Chemical Shelf Life: What Goes Off and When

Liquid chlorine is perishable, tablets pressurize a sealed bucket, and cal hypo cakes without losing its bite. How long each product lasts and how to tell.

5 minUpdated Sep 6, 2026
Two plain white chemical buckets stored well apart on separate shelves in a ventilated shed
SafetyGuide

Pool Chemicals That Must Never Mix

The specific combinations that cause fires and gas, plus the five ordinary moments they happen in — a shared scoop, a topped-up feeder, a leaking shelf.

5 minUpdated Sep 6, 2026
A short row of plain white pool chemical buckets and jugs on a garage shelf, lids seated, every label turned away
GuidesGuide

Pool Chemicals Worth Keeping on Hand

Eight products cover a season. Two of them are sold at four times the price under a pool label, and most of the rest of the shelf treats symptoms.

5 minUpdated Sep 13, 2026
A round above-ground pool with a steel frame and wide top rail standing on a level lawn, the wall and uprights seen from outside the pool
ReviewsBuying guide

The Best Above Ground Pools in 2026

Frame pools and steel-wall pools are different products with different lifespans and prices. Which you are shopping for, and what the set leaves out.

6 minUpdated Sep 12, 2026
An open plain white tub of chlorine granules with a scoop standing in it on wet coping, the granules coarse and bright
ReviewsBuying guide

The Best Pool Chlorine and Shock in 2026

What to actually keep in the shed. Which chlorine to buy for daily dosing, which for shocking, and the two you should never store side by side.

5 minUpdated Sep 6, 2026
Plain white tubs and a strip bottle grouped on the edge of a hot tub cabinet, the cover folded back, steam lifting off the water behind them
Spas & Hot TubsBuying guide

The Hot Tub Chemicals You Actually Need in 2026

What to buy for a hot tub, starting from your maker's own sanitizer list: chlorine granules, a weekly oxidizer, and bromine only if your tub allows it.

5 minUpdated Oct 1, 2026
A wall brush, a leaf rake and a telescopic pole laid parallel on wet stone coping, bristles and net mesh
ReviewsBuying guide

The Pool Cleaning Tools Worth Owning

Six tools cover almost every job a pool asks of you. Which to buy, which brush your surface actually needs, and where spending more genuinely pays.

5 minUpdated Sep 6, 2026
A multiport valve head filling the frame on top of a sand filter, its lever pressed down and rotated to one side
MaintenanceHow-to

How to Backwash a Sand Filter, and How Often

The full backwash sequence step by step, when pressure says it is time, and why backwashing on a schedule makes your water worse rather than better.

6 minUpdated Sep 25, 2026
A pool excavation with rebar cage tied and ready for shotcrete
InstallationGuide

Pool Construction Timeline: Week by Week

The real build sequence for gunite, fiberglass and vinyl pools, where delays come from, and what your yard looks like at each stage.

5 minUpdated Aug 23, 2026
A weatherproof equipment enclosure open on a wall beside the pad
EquipmentGuide

Pool Automation: What's Worth Wiring In

What pool automation actually controls, when it earns its cost, and the features that turn out to be a login you never use.

6 minUpdated May 8, 2026
A pool heater with its service panel open showing the burner tray
RepairsTroubleshooting

Pool Heater Not Heating? Diagnose It in Order

Most heater faults are flow problems, gas supply problems or a dirty sensor. Here's the order to check things, and where to stop and call a pro.

6 minUpdated Sep 12, 2026
Hazy, milky pool water seen from the deck edge, bottom of the pool barely visible
Water ChemistryTroubleshooting

Cloudy Pool Water: Causes and How to Clear It Fast

Six things turn pool water cloudy and only one of them needs clarifier. Work through them in this order and you'll fix it in a day instead of two weeks.

5 minUpdated Sep 12, 2026
Several clear test vials and plain dropper bottles arranged on wet stone
ReviewsBuying guide

The Best Pool Test Kits in 2026

Real models and real prices. Why a $150 drop kit beats a $20 box of strips, and what each one can and cannot actually measure.

6 minUpdated Sep 12, 2026
A modern variable-speed pump photographed cleanly at the equipment pad
ReviewsBuying guide

Best Variable-Speed Pool Pumps in 2026

Real model numbers, real prices and the spec that actually decides which variable-speed pump you should buy. Hint: it isn't energy savings.

7 minUpdated Sep 24, 2026
A robotic pool cleaner climbing a pool wall underwater
ReviewsBuying guide

The Best Robotic Pool Cleaners in 2026

Dolphin's Nautilus robots carry one year of warranty and its Premier and Sigma three. Here's what that means for which robot is worth buying, with real specs.

6 minUpdated Sep 13, 2026
A skimmer net, brush, test kit and chemical buckets laid out on pool coping
GuidesGuide

New Pool Owner Guide: Your First 30 Days

A pool came with the house and nobody explained it. Here's what to identify, what to test, what to buy and what to ignore in your first month.

6 minUpdated Sep 24, 2026
Brush, net, test kit and tablets arranged neatly on pool coping
MaintenanceChecklist

The Weekly Pool Care Checklist (Printable)

The exact weekly pool routine, in order, with the twice-weekly jobs separated from the once-weekly ones. Takes about 25 minutes.

5 minUpdated Sep 14, 2026