Active vs passive winterization: what to recommend to each customer
Every autumn customers ask whether they can forget about the pool until spring. The answer depends on climate, equipment and use. The right choice protects the shell and equipment, avoids a costly reopening and keeps a relationship — and revenue — through the low season.
The two options at a glance
| Active | Passive | |
|---|---|---|
| Filtration | Reduced daily cycles | Stopped; equipment drained or protected |
| Water level | Normal | Lowered according to skimmer type and manufacturer guidance |
| Chemistry | Periodic checks and moderate adjustments | Shock and winterizing product at closing |
| Visits | Every 2-4 weeks depending on the site | Closing, occasional check and opening |
| Best climate | Mild winters without prolonged frost | Frequent frost or pools left unused |
When to recommend active winterization
It is the usual choice in coastal and mild areas. Reduced filtration keeps water moving, lets you correct pH in time and makes the spring opening much simpler. It also suits pools with automatic covers, communities that want the area to stay presentable and owners who use the property in winter.
If there is occasional frost risk, running filtration during the coldest hours and a frost-protection setting help protect pipes and equipment. Always check manufacturer guidance.
When to recommend passive winterization
It makes sense inland or in mountain areas with frequent frost, second homes closed for months or sites where periodic checks are not possible. It requires a proper closing: cleaning, balanced water, shock treatment, winterizing product, lowering the level where appropriate, draining the pump, filter and exposed pipes, and a cover in good condition.
The electricity saving is real, but explain that reopening deteriorated water may need more product and more labour.
Equipment that changes the decision
Salt chlorinator
Below roughly 15 °C many cells lose efficiency and can be damaged. Check the manual: production is usually reduced or switched off and supplemented with another treatment.
Heat pump and probes
Drain or protect circuits per the manufacturer and store pH/ORP probes in storage solution if filtration stops.
Covers and slatted covers
Gases build up under a closed cover; avoid overdosing and respect recommended levels to protect the slats.
Turn winter into revenue
- 1
Offer a winter plan
A visit every two to four weeks with water checks, basket cleaning and equipment inspection — cheaper for the customer than a problematic opening.
- 2
Sell closing and opening as services
If the customer chooses passive winterization, quote closing and start-up separately with their own task lists.
- 3
Document every visit
A report with photos and readings justifies the fee and protects your work if a fault appears in spring.
- 4
Rebalance routes
With fewer visits, regroup zones so you do not drive half a day for two pools.
Before closing the season with each customer
Assessment
- Is there frost risk in the area?
- Which equipment is installed (salt, heat pump, cover)?
- Will the pool or property be used in winter?
Proposal
- Have you explained the cost of reopening deteriorated water?
- Have you offered a winter plan with a clear frequency?
- Is the decision recorded on the pool record?
Keep reading: Chemical dosing calculator · How to fix a green pool · Route profitability
Winterization FAQ
Which winterization is best in mild climates?+
Usually active: water stays under control with reduced filtration and opening is easier. The final choice depends on the equipment and frost risk.
Can a salt chlorinator be switched off in winter?+
Many manufacturers recommend switching it off or reducing output in cold water. Follow the equipment manual and supplement sanitation where needed.
How much should I charge for winter service?+
It depends on your area and costs. Price the actual visit and travel time at the lower frequency rather than reusing the summer fee.
Plan winter visits for your whole customer base
30-day trial, no card required. From €14.90/month.