A swimming pool is one of the most complex mechanical systems in a residential property — combining water chemistry, circulation, filtration, heating, electrical, and in many cases automated control systems. It’s also one where deferred maintenance compounds quickly: an improperly balanced pool damages equipment, ruins surfaces, and can create health hazards. A qualified pool service company prevents all of that. An unqualified one can cause it while charging you for the privilege.
Pool service in many regions covers a wide range of work: seasonal opening and closing, weekly maintenance during the swimming season, equipment repair and replacement, water chemistry management, liner replacement, and equipment upgrades. Each has different technical requirements and different questions to ask.
“The pools I see the most problems with are the ones where the homeowner either tried to manage it themselves without really understanding the chemistry, or hired whoever was cheapest without asking about their qualifications. Pool chemistry isn’t complicated when you know what you’re doing, but it doesn’t forgive guesswork. Improperly balanced water destroys equipment, damages liners, and can make swimmers sick. The right service company pays for itself very quickly in equipment life alone.”
— Adam from Clark Pools & Spas, pool and spa specialist with over 40 years of experience providing pool installation, maintenance, and hot tub services in Owen Sound, focused on reliable service, quality workmanship, and long-term customer support
Table of Contents
Before You Call Anyone
What type of pool do you have?
The type of pool significantly affects service requirements, chemistry management, and the qualifications needed from a service company:
Inground pools:
– Vinyl liner: Most common in many regions. The liner is a replaceable membrane that lines the pool shell. Water chemistry that’s too aggressive (low pH, high chlorine) damages the liner. Liners typically last 10–15 years.
– Fibreglass: A one-piece fibreglass shell. Very durable, smooth surface that resists algae. Different chemistry requirements than vinyl.
– Concrete/gunite: The most durable and customizable. Surfaces (plaster, pebble, tile) require specific chemistry management.
Above-ground pools: Different equipment, typically simpler chemistry management, but the same principles apply.
What service are you hiring for?
Seasonal opening: Removing the winter cover, reinstalling equipment, starting up filtration and heating systems, initial water balancing for the season.
Weekly maintenance: Regular visits to test and balance water chemistry, clean filters, skim debris, and check equipment.
Seasonal closing: Winterizing the pool — balancing chemistry for winter, blowing out lines, storing equipment, installing the winter cover. Done correctly, this protects the pool through your region’s freeze-thaw winter.
Equipment repair or replacement: Pump, filter, heater, automation system, lighting.
Liner replacement: Removing the old liner and installing a new one.
Renovation: Pool surface resurfacing, coping replacement, deck work, equipment upgrades.
Questions to Ask Before Hiring
Is your company a registered business with insurance?
Pool service involves working with electrical systems, chemicals, and significant equipment. Liability insurance covers damage to your property and equipment. Ask for a certificate of insurance.
How long have you been servicing pools, and do you specialize in my pool type?
Experience with your specific pool type matters — vinyl liner chemistry is managed differently from fibreglass chemistry, and concrete pool surface care is different again. Ask specifically how many pools of your type they service.
Do you have certifications in pool and spa operation?
The Pool and Hot Tub Alliance (PHTA) offers professional certifications for pool operators and service technicians:
Certified Pool Operator (CPO): The industry standard certification. Covers water chemistry, filtration, circulation, and health code requirements.
Certified Service Technician (CST): Specifically for service and repair technicians.
Ask whether the technician who will be servicing your pool holds current certifications.
What a good answer looks like: Current CPO or CST certification confirmed, with the technician’s name and certification number available.
Are you licensed for any electrical work involved in the service?
Pool electrical work in many regions — including any wiring associated with pumps, heaters, lights, and automation systems — requires a licensed electrician. If any electrical work is part of the scope, confirm that it will be performed by or supervised by an your local electrical safety authority-licensed electrician.
Questions About Water Chemistry
How will water chemistry be tested and managed?
Ask specifically what testing method is used:
Test strips: Quick and convenient but less accurate than liquid tests.
Liquid drop test kits (Taylor or similar): More accurate, can test a wider range of parameters.
Digital photometer or electronic testing: The most accurate method, used by professional service companies.
A professional service company tests at minimum: pH, total alkalinity, free chlorine (or other sanitizer), calcium hardness, and cyanuric acid (stabilizer level). Some also test for metals (copper, iron) and salt levels for saltwater pools.
Ask what parameters are tested at each visit and what the target ranges are for your specific pool type.
For more: Questions to Ask a Pool Service Company About Water Chemistry
What sanitization system does my pool use, and how will it be managed?
Chlorine: The most common sanitizer. Free chlorine level should be maintained at 1–3 ppm. PH directly affects chlorine effectiveness — at pH 7.8, chlorine is much less effective than at pH 7.2.
Salt chlorinator (saltwater pool): A salt chlorine generator converts dissolved salt into chlorine. The pool is still a chlorine pool — but the chlorine is generated on-site. The generator cell requires periodic cleaning and eventual replacement.
UV or ozone systems: Secondary sanitization systems that reduce (but don’t eliminate) the need for chlorine.
Ask how the company manages your specific sanitization system and what the maintenance requirements are for any secondary systems.
Questions About Seasonal Opening
What does the opening service include?
A professional pool opening should include:
- Removing and properly storing the winter cover (cleaning and folding, not just pulling it off)
- Reinstalling return fittings, skimmer baskets, and other equipment removed for winter
- Reconnecting and starting up the pump and filter
- Starting up the heater (and verifying proper operation)
- Initial water testing and balancing — multiple chemistry parameters
- Adding opening chemicals as needed (algaecide, shock, balancing chemicals)
- Inspecting the liner or surface for winter damage
- Inspecting equipment for any winter damage or wear
Ask for a specific list of what’s included in the opening service and whether there’s an additional charge for chemicals.
For more: Questions to Ask a Pool Service Company About Opening and Closing
Questions About Equipment
What is the condition of my pool equipment, and what is its expected remaining life?
At a minimum annually — and at any service visit if you haven’t had a recent assessment — ask the service company to assess:
- Pump: Age, condition, efficiency. Pool pumps typically last 8–12 years. Variable speed pumps are significantly more energy-efficient than single-speed pumps.
- Filter: Type (sand, cartridge, diatomaceous earth), condition, when it was last serviced.
- Heater: Age, condition, efficiency. Gas heaters typically last 7–12 years.
- Automation system: If present, is it communicating correctly with all equipment?
- Liner: Age and condition (for vinyl liner pools). Are there areas of concern?
For more: Questions to Ask a Pool Service Company About Equipment and Repairs
Red Flags to Watch For
Unable to explain the chemistry parameters they’re managing. A professional pool service technician should be able to tell you immediately what the current pH, alkalinity, and chlorine levels are and what they’re targeting. If they can’t explain the numbers, they’re not managing the chemistry professionally.
Seasonal closing done without blowing out the lines. In many regions’s climate, water left in pool plumbing freezes and cracks pipes — a very expensive repair. A professional closing includes blowing out all lines with a compressor. Any company that doesn’t include this step is doing an incomplete closing.
Adding chemicals without testing first. Chemicals should be added in response to test results, not as a routine regardless of actual water conditions. A company that adds the same chemicals at every visit without testing is guessing.
No written service record. A professional service company provides written documentation of what was tested, what the results were, and what was added at each visit.
For a full guide: Red Flags When Hiring a Pool Service Company
Before They Start: A Quick Checklist
- Business registration and insurance verified
- CPO or CST certification confirmed
- Pool type experience confirmed
- Chemistry testing method and parameters described
- Opening/closing scope specified in writing
- Equipment assessment included
- Written service records confirmed as standard
- Payment schedule and service agreement terms agreed
Related Questions
- Questions to Ask a Pool Service Company About Water Chemistry
- Questions to Ask a Pool Service Company About Opening and Closing
- Questions to Ask a Pool Service Company About Equipment and Repairs
- How Much Does Pool Service Cost ?
- Red Flags When Hiring a Pool Service Company
- What to Do If a Pool Service Company Does Bad Work
- How Do I Know If My Pool Water Is Safe to Swim In?
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