Chlorine"The only pool company in the Pacific Northwest that guarantees swim-ready water 365 days a year."
Seattle's soft water, Pacific needles, and nine months of overcast skies create pool chemistry no Sun Belt manual covers. We wrote the local playbook.
12+
Years in Seattle
340+
Active Pools
100%
Satisfaction Rate
pH 7.4 · Free Cl 2.1 ppm · Temp 84°F
Checked this morning — Mercer Island, WA
Real specialists.
Region-specific knowledge.
Most pool companies learn chemistry in Phoenix. Our team trained in the Pacific Northwest — where soft water, conifer debris, and year-round operation create entirely different conditions.
Dr. Mara Lindqvist
Water Chemistry Specialist
"Seattle's municipal water is exceptionally soft — around 20–30 mg/L total hardness compared to Phoenix at 250+. That single fact rewrites the entire chemistry playbook."
Soft water is aggressive: it strips calcium from plaster and grout faster than any Sun Belt pool. You need a Langelier Saturation Index between +0.1 and +0.3 year-round — not just summer.
Chlorine demand spikes in September when alder and cedar pollen saturates the water. We pre-dose cyanuric acid at 30–40 ppm before the fall bloom, not after.
Seattle's overcast winters mean UV stabilizer burns off slowly — but biofilm growth accelerates in cool water. We switch to a dual-oxidizer protocol November through March.
20–30 mg/L
Seattle water hardness vs. 250+ in Phoenix
"Eastside clients run their pools year-round. That means a heat pump working against 40°F ambient air and plumbing that sees freeze-thaw cycles every other week from November to February."
A heat pump loses 30–40% efficiency below 45°F. We install a secondary propane booster on pools where owners need 84°F water during the coldest weeks — it pays back in energy cost by March.
Freeze protection sensors fail silently. We test every auto-circulation controller at the October service visit, not when the client calls about a burst fitting in January.
Salt chlorinators under-produce below 60°F water temperature. We adjust output levels monthly from October through April — something most services skip because it requires a return visit.
40°F
ambient temp where heat pump efficiency drops 35%
James Okonkwo
Equipment & Freeze-Protection Technician
Sofia Nakamura
Health Code & Compliance Advisor
"King County Health Department updated drain-cover regulations in 2023. If your HOA pool hasn't had a VGB-compliant inspection since then, you're operating outside code — and your property manager may not know it."
Virginia Graeme Baker Act requires anti-entrapment covers rated for your specific pump flow rate. A cover that passed inspection in 2019 may not comply with your new variable-speed pump installed in 2022.
Airbnb hosts in Seattle need to treat short-term rental pools as commercial facilities under WAC 246-260. That means log books, licensed operators, and 48-hour water test records.
King County requires a licensed operator on-call for any pool serving more than one unit. We provide that coverage for property managers — documented, insured, and compliant.
2023
King County drain-cover regulation update
The Seattle Pool
Owner's Guide
47 pages written for Pacific Northwest conditions — not copy-pasted from a Florida training manual. Free, no subscription, no follow-up sales calls.
Winterization Schedule
Month-by-month checklist for heated pools staying open October–April
PNW Chemical Balance Charts
Adjusted for Seattle's soft water and overcast UV conditions
King County Code Checklist
VGB compliance, drain covers, operator licensing requirements for 2025
Fall Debris Protocol
Alder, cedar, and fir needle management before they crash your chemistry
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Reader Rating
"Swim-ready" isn't a slogan.
It's the standard.
We have three Airbnb units on Capitol Hill with a shared pool. Before Chlorine, a single bad water review almost cost us our Superhost status. Now I don't think about the pool at all — and that's exactly what I need.
Priya Anand
Airbnb Superhost, Capitol Hill
I manage 14 HOA pools between Bellevue and Burien. Chlorine handles the King County compliance paperwork and the chemistry. I haven't had a health department citation in two years.
Derek Holmstrom
Property Manager, Eastside Portfolio
We heat our pool to 84°F year-round. Every other company told us it wasn't worth it in Seattle winters. Chlorine told us exactly what the chemistry shift looked like in February and handled it without us ever seeing green water.
Lena Ostrowski
Homeowner, Mercer Island
Have a pool question?
Get a real answer.
Not a contact form that routes to a call center. One of our three specialists reads every question and responds personally — usually within one business day.
Not ready to schedule? That's fine. We believe the right way to earn a client is to be genuinely useful before asking for anything. Ask your question — no strings.