Chlorine

Rooftop pool at dusk in Hong Kong, dark water with submerged teal LED glow illuminating mosaic tile, city towers soft-focused in background

Hong Kong Pool Specialists · Est. 2019

Your Pool Is Talking.
Here’s What It’s Saying.

We service the filtration rooms, rooftop infinity edges, and basement plant rooms of Hong Kong’s most demanding properties — so your water stays clear through every typhoon season.

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Filter Backwash & Media ReplacementpH & Chlorine BalancingLCSD Compliance InspectionsTile & Grout ScrubbingPump Room ServicingAlgae Treatment & PreventionWater Quality ReportsEmergency Call-OutsSeasonal WinterisationRooftop Infinity Edge CareFilter Backwash & Media ReplacementpH & Chlorine BalancingLCSD Compliance InspectionsTile & Grout ScrubbingPump Room ServicingAlgae Treatment & PreventionWater Quality ReportsEmergency Call-OutsSeasonal WinterisationRooftop Infinity Edge Care

The Field Guide

Questions Your Pool
Has Already Answered

Real questions from Hong Kong property managers, hotel GMs, and residential owners — answered with the same directness we bring to every service visit.

Asked by: Repulse Bay residential manager, August

“Why does my pool turn green after a typhoon?”

Typhoon rain dilutes your chlorine residual while debris — leaves, soil, airborne organics — floods the water with nutrients. Algae, which is always present in trace amounts, seizes that window. Within 48 hours of chlorine dropping below 0.5 ppm, you have a bloom. The fix is not simply shocking the pool; you need to address the alkalinity, scrub the walls before brushing algae spores deeper, and run the filter continuously for 24 hours minimum. We recommend a post-typhoon check within six hours of the all-clear signal.

Algae Growth Cycle — Post Typhoon

Typhoon passes

12h

Debris settles

24h

Chlorine drops

48h

Algae blooms

72h

Green water

Without treatment, green water appears within 3 days

Asked by: Hotel GM, Wan Chai property

“How often do I really need to test the water?”

Twice weekly is the professional standard for commercial pools in Hong Kong — daily during peak summer (June–September) when bather loads and UV intensity accelerate chlorine consumption. pH should sit between 7.2 and 7.6; outside that window, chlorine becomes 80% less effective. Free chlorine target is 1–3 ppm. Total alkalinity 80–120 ppm acts as your pH buffer. Cyanuric acid, if you use stabilised chlorine, should not exceed 50 ppm or it locks chlorine into an unusable form. We provide written water quality reports after every service visit.

pH Scale — Ideal Range

Acidic

6.0–7.0

Corrosive to fittings

Ideal

7.2–7.6

Safe & comfortable

Alkaline

7.8–8.5

Chlorine ineffective

Test twice weekly during summer months

Asked by: Mid-Levels clubhouse facilities team

“How often does the filtration system actually need servicing?”

Sand filters require backwashing every 4–6 weeks under normal load — more frequently after heavy use or post-typhoon. Filter media itself degrades: sand should be replaced every 5–7 years, DE (diatomaceous earth) recharged after each backwash. The pump motor seal and impeller should be inspected annually; a failing seal wastes 15–20% of flow efficiency before it fails completely. Pressure gauges above 10 psi over baseline indicate a clogged filter needing immediate attention. We document all readings at each visit so you have a maintenance record for LCSD inspections.

Filtration Loop — Key Checkpoints

01Skimmer basketWeekly clean

02Hair & lint strainerWeekly inspect

03Sand/DE filter media3–5 year replace

04Pump motor sealAnnual inspect

05Return jetsMonthly check

06Backwash valveBiannual service

Current Due for service

Book a Visit

A Pool Assessment
Worth the Morning.

We visit the property, test the water, inspect the plant room, and leave you a written report — including any LCSD compliance gaps — within 24 hours. No obligation to proceed.

◎Full water chemistry panel (9 parameters)

◎Plant room inspection & pressure readings

◎Tile & grout condition assessment

◎Written report within 24 hours

◎LCSD compliance gap summary

47 properties serviced

Mid-Levels · Repulse Bay · Wan Chai

Compliance & Costs

The Questions That
Keep GMs Awake.

Asked by: Mid-Levels clubhouse, following a health department letter

“Is my pump room compliant with LCSD regulations?”

The LCSD Code of Practice for Swimming Pools (revised 2023) requires daily water quality logs, proper chemical storage with Safety Data Sheets posted, ventilation certification for enclosed plant rooms, and monthly emergency equipment checks. Many older buildings in Mid-Levels and Repulse Bay have plant rooms that predate the 2023 revision and lack compliant labelling or ventilation records. A single health department flag during an inspection can trigger a pool closure. We review your plant room against the current LCSD checklist and produce a gap report — most properties need only minor administrative updates, not structural changes.

LCSD Compliance Checklist — Pool Plant Room

Water quality log (daily readings)Daily

Chemical storage labelling & SDSOngoing

Filter pressure differential recordsWeekly

Pump room ventilation certificationAnnual

Lifeguard certification (where applicable)Annual

Emergency equipment inspectionMonthly

Backwash discharge permitSituational

Source: LCSD Code of Practice for Swimming Pools (2023 revision)

Asked by: Boutique hotel GM, Sai Ying Pun

“What does a full year of pool maintenance actually cost?”

For a commercial pool in Hong Kong — a rooftop hotel pool running year-round — expect HK$2,800–4,500 per month for twice-weekly servicing including chemicals, written reports, and emergency call-out priority. Residential pools (Mid-Levels, Repulse Bay) typically run HK$1,200–2,200 per month on a weekly service schedule. That includes all chemical costs, filter backwashing, and a written log suitable for LCSD inspection. The cost of a single health department closure — lost revenue, remediation, re-inspection fees — typically exceeds a full year of professional maintenance. We quote per property after the assessment visit.

Hong Kong Pool — Seasonal Service Calendar

SpringMar–May

·Restart seasonal pools
·Full water chemistry reset
·Filter media inspection
·Pre-summer equipment service

SummerJun–Sep

·Daily chemical testing
·Post-typhoon response
·Weekly algae prevention
·Filter backwash every 3 weeks

AutumnOct–Nov

·Reduce chemical dosing
·Leaf & debris management
·Tile deep scrub
·Pump seal inspection

WinterDec–Feb

·Maintain 0.5–1 ppm chlorine
·Monthly water balance
·Heater efficiency check
·Plan spring restart

From the Properties

What They Said
After the Visit.

Clients across Mid-Levels, Repulse Bay, Wan Chai, and the southern district.

72hrs

Post-typhoon clearance

“After Typhoon Saola, we had green water by Monday morning. Chlorine arrived at 7am, had the pool clear by Thursday. The written report documented everything for the management company. First time we've had that level of accountability.”

Margaret Lau

Property Manager · Residential clubhouse, Repulse Bay

Compliance flags, 2024

“The LCSD inspection last October was the smoothest we've had. Chlorine's maintenance logs and plant room records were exactly what the inspector needed. We passed without a single flag.”

David Thornton

General Manager · Boutique hotel, Sai Ying Pun

HK$0

Hidden remediation costs

“Our helper was reporting cloudy water every few weeks. Turned out the filter media was five years overdue for replacement — something the previous contractor never flagged. The assessment report paid for itself immediately.”

Priya Mehta

Homeowner · Private residence, Mid-Levels West

<2hrs

Emergency response time

“Two men, but they know every piece of equipment in our plant room. Response time on WhatsApp is faster than our building management office. That matters when you have 180 residents and a pool that cannot close.”

James Fong

Facilities Director · Serviced apartment complex, Wan Chai

The Hong Kong Pool Owner’s

Seasonal Checklist

Contents

Pre-summer startup checklist (12 items)

Post-typhoon 6-hour action protocol

Monthly water chemistry log template

LCSD plant room compliance items

Seasonal chemical dosing guide

Emergency contractor contact list

Chlorine HK · 2026 EditionFree PDF

Free Download

Free Resource

The Hong Kong Pool Owner’s Seasonal Checklist

A single-page reference we give every new client. Covers the twelve checks that prevent 80% of the service calls we receive — from pre-summer filter startup to post-typhoon response windows.

Formatted for poolside use. Includes the LCSD compliance items most property managers miss until inspection day.

Requires email and district — helps us send relevant seasonal reminders.

Your Pool Is Talking.Here’s What It’s Saying.

Questions Your PoolHas Already Answered