Pool Water Chemistry · Denton County, Texas
Denton County fill water is hard, already alkaline, and evaporating up to three inches a week in July. Left alone, every pool here drifts the same direction: calcium climbs, pH runs high, and chlorine burns off by mid-afternoon. We test what actually matters and correct it in the right order.
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What we test, and why each one matters
- Free chlorine, the only thing killing bacteria and algae
- Combined chlorine, the chloramines behind the pool smell
- pH, which decides how much of your chlorine is actually working
- Total alkalinity, the buffer that holds your pH in place
- Calcium hardness, the North Texas problem parameter
- Cyanuric acid, chlorine sunscreen and its most common saboteur
- Salt, measured against your own cell manufacturer target
- Phosphates, the algae food our spring pollen loads into your pool
- Filter pressure and run time, because chemistry cannot fix circulation
- A written record of every reading, visit over visit
Your numbers
Where your water should sit
| Ideal rangeWhere we hold your pool | If it runs lowWhat starts going wrong | If it runs highWhat starts going wrong | |
|---|---|---|---|
| Free chlorine | 2 to 4 ppm | Algae and bacteria take hold, water goes green | Stings eyes, bleaches swimwear, corrodes metal |
| Combined chlorine | 0 ppm | Not possible | The chlorine smell, irritated eyes, sanitizer already used up |
| pH | 7.4 to 7.6 | Etches plaster, corrodes heater cores, stings eyes | Chlorine stops working, scale forms, water clouds |
| Total alkalinity | 80 to 120 ppm | pH bounces on any small addition | pH locks high and resists correction |
| Calcium hardness | 200 to 400 ppm | Water pulls calcium out of your plaster | Scale on tile, heater, and salt cell |
| Cyanuric acid | 30 to 50 ppm | Chlorine burns off in hours under Texas sun | Chlorine reads fine and still will not work |
| Saltsalt pools only | 3,200 ppm typical, per your cell | Cell output drops, cell fails early | High salt alarm, corrosion risk above 6,000 |
| Phosphates | Under 500 ppb | No downside | Algae grow faster than chlorine can keep up |
Why Denton County pools are harder to balance
Our fill water runs 7 to 14 grains per gallon, which is classed hard to very hard, so every top-off adds calcium. It also arrives carrying 150 to 350 ppm alkalinity, well above the 80 to 120 your pool wants, which is why local pools need acid on a routine schedule. Then summer evaporation takes one to three inches a week: water leaves, minerals stay, and calcium ratchets upward all season. Add a UV index of 9 to 11 and chlorine tabs that quietly push stabilizer past 100 ppm by August, and you get the call we hear every year: a green pool with test numbers that look perfect.
How it works
Testing that comes with a correction, not a lecture
Every visit includes a full panel, the adjustments to bring you back into range, and a record of what changed. Chemistry in this climate can move meaningfully in five days, which is why we test weekly instead of guessing.
Our Process
How we keep your water right
Full panel on every visit
Eight parameters, tested on site with professional equipment rather than strips.
Corrections in the right order
Alkalinity before pH, always. Chasing pH first is the most common reason a pool will not hold its numbers.
A record you can actually see
You get the readings after every visit, so you can watch the trend instead of taking our word for it.
Meet David, your local pool pro
My Pool Helper is owner-operated by David. He learned pool care from the ground up in a family that has spent more than 30 years in the business, and built My Pool Helper on three rules he won’t bend on: show up every time, tell you the truth (no upsells), and sweat the small stuff — right down to a written water report after every visit.
David is a Certified Pool Operator (CPO), licensed and insured in Texas — so your home and your pool are in qualified hands.
We know Denton County pools inside and out
My Pool Helper is owner-operated and based right here in Denton County, so your pool is cared for around the realities of North Texas — not a generic checklist. Our tap water is classified “very hard” (about 15 grains per gallon, drawn from the Trinity Aquifer and Lewisville Lake), which scales tile, plaster, and salt cells fast. We check calcium hardness on every visit and balance for it, so the local water never quietly wears down your pool.
North Texas weather is just as demanding. Summers top 100°F and intense UV burns off chlorine and stabilizer within days — the reason weekly service beats bi-weekly here, and why we tune cyanuric acid and sanitizer for our exact climate. Then winter flips the script: a sudden hard freeze (like February 2021) can crack pumps, filters, and lines overnight. From Denton and Flower Mound to Argyle, Highland Village, and Lantana, it’s the local know-how that keeps pools clear all year.
Areas we serve
- Denton
- Flower Mound
- Highland Village
- Argyle
- Lantana
- Justin
- Corinth
- Lake Dallas
- New Fairview
- Cross Roads
- Sanger
- Krum
- Trophy Club
- Roanoke
- Hickory Creek
- Lewisville
- Ponder
- Haslet
- Northlake
- Keller
- Southlake
- Westlake
Common Questions
Everything you need to know
Why is my chlorine not working even though the level looks fine?
Why does my pH keep drifting up no matter what I do?
Two likely reasons here. Your total alkalinity is high, probably from months of topping off with North Texas tap water, and high alkalinity drags pH up with it. Or you have a salt system, since the electrolysis process itself raises pH continuously.
Why is there white crust on my tile?
Calcium scale. Your calcium hardness, your pH, or both are running high. It is the most common water problem in Denton County and it does not resolve on its own.
Are test strips good enough?
For chlorine and pH between visits, yes. For calcium hardness, cyanuric acid, and alkalinity, no, and those three are the ones that cost you a heater or a plaster job.
How often should pool water be tested?
Weekly during the season. In this climate the numbers can move meaningfully in five days, and by the time the water looks wrong you are already behind.
Can I balance the water myself?
Plenty of people do. The two things that trip up most owners here are the order of adjustments and the fact that our fill water is working against you every single time you add it.
Other Services
Weekly Maintenance
Skimming, brushing, vacuuming, chemistry, and equipment checks — done on a set schedule by the same local pro, every week.
Equipment Repair
Pumps, filters, heaters, salt systems, automation, and lighting — diagnosed and repaired fast, with same-day emergency service available.
Green to Clean
Green or cloudy after a vacation or off-season? We get neglected pools back to sparkling — no long-term contract required.
Ready for a pool you can actually enjoy?
Get a free quote today. Choose between full weekly maintenance or a chemicals-only weekly service — both keep your pool dialed in.