If your pool has sat unused for a season (or several), you’re facing a decision that thousands of Hunter region pool owners confront every year: winterise and mothball the pool to reduce running costs, or remove it and reclaim the space. Both options have real costs and real trade-offs. The right answer depends on how long you plan to own the property, whether you might use the pool again, and what the pool’s current condition demands.
This guide works through the comparison honestly, without pushing you toward removal as the default answer.
What Is Winterising (Mothballing) a Pool?
Winterising a pool means putting it into a low-maintenance, safe state for an extended period, typically a season or more, when it won’t be actively used. It’s not the same as “switching the pump off”, a poorly closed pool quickly develops algae, becomes a mosquito breeding ground, and deteriorates faster than an actively maintained one.
Proper winterising in the Hunter region involves:
- Balance the water chemistry: Adjust pH, alkalinity, and calcium hardness to optimal ranges before closing
- Shock dose: A large chlorine or non-chlorine shock to kill existing algae and bacteria
- Algaecide dose: Long-acting algaecide to suppress growth over the closed period
- Lower the water level: To below the skimmer opening
- Drain the equipment: Pump, filter, and chlorinator must be drained to prevent water sitting in them; in the Hunter region, the risk of freeze damage is low but stagnant water accelerates equipment corrosion
- Remove and store equipment (optional but recommended for expensive items)
- Cover the pool: A quality safety cover prevents debris, reduces evaporation, and limits UV degradation of the water chemistry
Ongoing during the closed period:
- Check the cover weekly for debris accumulation
- Test and adjust water chemistry monthly (even with a cover and algaecide, chemistry drifts)
- Run the pump briefly (2-3 hours) once per week to circulate water and prevent stagnation
The idea that a winterised pool is “zero maintenance” is a myth. It’s reduced maintenance, not no maintenance.
Annual Running Costs: Active Pool vs Winterised vs Removed
Comparing the real annual costs is the core of this decision:
| Cost Category | Active Pool (Year-Round) | Winterised Pool | Removed Pool |
|---|---|---|---|
| Electricity (pump, chlorinator, lights) | $800 to $2,000/year | $100 to $300/year | $0 |
| Chemicals (salt, chlorine, stabiliser, algaecide) | $600 to $1,500/year | $150 to $400/year (closing treatment) | $0 |
| Filter media replacement | $100 to $300/year | Same (less frequent) | $0 |
| Equipment servicing | $200 to $500/year | $100 to $300/year | $0 |
| Pool cleaning / vacuuming | $300 to $600/year (DIY) or $1,500 to $3,000/year (contractor) | $100 to $200/year | $0 |
| Pool fence maintenance | $100 to $300/year | $100 to $300/year | $0 |
| Insurance (pool liability component) | Estimated $100 to $300/year addition to policy | $100 to $300/year | $0 |
| Annual total estimate | $2,200 to $7,000+ | $650 to $1,700 | $0 |
Winterising reduces annual pool costs by 70-80% compared to an actively run pool, but it doesn’t eliminate them. Over five years of winterising, you’d spend approximately $3,250 to $8,500 on a “mothballed” pool.
Over the same five years, a pool removal at $20,000 would cost $20,000 total, but then $0 per year indefinitely. At this run rate, the removal breaks even against winterising at roughly seven to twelve years of closed pool.
The Non-Financial Trade-Offs
Winterising pros:
- Preserves the option to reactivate, if your lifestyle changes, kids get older, or you sell and want to appeal to family buyers, the pool is still there
- No upfront capital cost (no removal cost)
- Reversible decision, you’re not committed
Winterising cons:
- Ongoing cost and time burden, even a mothballed pool demands attention
- Ongoing safety obligation, pool fencing compliance, registration, and liability insurance
- Risk of accelerated deterioration while under-maintained
- Risk of abandonment, many “I’ll just close it for now” pools end up as abandoned, mosquito-breeding health hazards (see our abandoned pool health risk guide)
Removal pros:
- Zero ongoing cost from day one
- Safety and regulatory obligations end
- Reclaims yard space for other use
- Cleaner presentation for property sale
- Definitive outcome, no lingering uncertainty
Removal cons:
- Upfront cost ($12,000 to $32,000 for in-ground pools)
- Irreversible, if you later want a pool, you’ll need to reinstall one
- Requires landscaping to fully restore the space
The “I’ll Decide Next Year” Trap
The most common outcome for unused pools is indefinite deferral. The pool is closed for winter, reopening is planned for summer but life gets busy, and the pool sits unused for another season. By year three, the chemistry is badly out of balance, the equipment hasn’t run in 18 months, and what was a borderline decision is now a problem pool.
If you’ve genuinely stopped using the pool, kids are grown, you don’t swim, the maintenance burden outweighs the benefit, the decision to remove is usually clearer than it feels. The uncertainty is real but it typically doesn’t resolve itself in favour of re-use. Most pools that are closed “temporarily” are eventually removed.
When Winterising Makes Sense
Winterising is the right choice when:
- You’re confident you’ll use the pool again within one to two years (young children who will grow into using it, an injury/health situation that will resolve, a period of travel)
- You’re planning to sell in the next 12 months and the pool adds value in your suburb
- The pool is in good condition, not a deteriorating structure that’s getting worse every month
- You actively manage the closed pool rather than ignoring it
When Removal Makes More Sense
Removal is the right choice when:
- The pool has been unused for two or more seasons and re-use isn’t genuinely planned
- The pool is in poor or deteriorating condition (see our cracked and leaking pool guide)
- The ongoing cost and obligation burden is affecting your quality of life or finances
- You want to sell and the pool is not adding value in your suburb
- The backyard space is more valuable to you than a pool you don’t use
How to Winterise Properly in the Hunter Region
If you decide to winterise, the Hunter region’s warm climate means algae risk remains higher in winter than in truly cold-climate states. The ocean-influenced humidity in coastal Newcastle and Lake Macquarie accelerates algae growth even in cool weather.
Effective winterising in the Hunter region specifically:
- Don’t use a fully dark cover (they heat the water slightly and encourage algae), use a light-coloured or meshed cover
- Dose algaecide at the higher end of the manufacturer’s recommendation
- Don’t skip the monthly water test, even with algaecide, chemistry can drift badly in two months
- Keep the pump on a timer for a few hours each week even while “closed”
If you’re not confident managing this, a pool service company can provide a “closed pool maintenance” service, typically $80 to $150 per month, to check and maintain water chemistry through the closed period.
The Best Time of Year to Remove
If removal is the decision, see our best time of year to remove a pool guide for optimal scheduling. In the Hunter region, autumn (March, May) tends to offer the best combination of mild weather, contractor availability, and optimal ground conditions.
Frequently Asked Questions
How much does it cost to properly winterise a pool in Newcastle? The initial chemical treatment (shock, algaecide, balance) costs $200 to $400 in chemicals. A good-quality pool cover is $300 to $1,500 depending on type and size. Ongoing monthly maintenance costs $80 to $150 if professionally managed, or less if DIY. Annual total for a properly closed pool: $650 to $1,700.
Will a closed pool deteriorate faster than an actively maintained one? A properly closed pool with maintained water chemistry shouldn’t deteriorate faster. A poorly maintained closed pool (no chemistry management, no cover, no circulation) absolutely will, pool water that isn’t treated rapidly becomes acidic or alkaline, both of which attack pool surfaces and equipment.
What if I close my pool and then decide I want to use it again? Reopening a properly closed pool typically takes one to two days of treatment: remove cover, inspect for winter damage, rebalance chemistry with a shock dose, run equipment, and vacuum. This is straightforward and not expensive if the pool was properly closed.
Does a closed pool still need a compliant pool fence? Yes. A closed pool is still a registered pool under NSW law and still requires a compliant pool barrier. The fencing obligation only ends when the pool is removed.
I haven’t touched my pool in two years, is it worth trying to winterise it now? Possibly not. A pool that has been fully abandoned for two years (no chemistry management, no cover) may have significant equipment failure, severe algae, or structural deterioration. Have a pool professional assess the current state before investing in closing treatment, you may find removal is more cost-effective than trying to restore it.
Struggling with the winterise-or-remove decision? Contact Hunter Pool Removals for a free, honest assessment, we won’t push you toward removal if winterising is the right call for your situation.