Pool Long-Life Winteriser - Off-Season Algaecide & Stabiliser

Long-life pool winteriser concentrate that prevents algae and stops scale through 4-6 months of pool closure. One dose at close-down keeps water clear and balanced under the cover.

• Stops algae growth through 4-6 months of pool closure.
• Inhibits calcium scale forming on cold water lines.
• Buffers pH against winter drift.
• Pairs with pipe antifreeze to give full winter protection.
• Cuts spring opening time and chemical demand.

Sizes and prices

Available in 5L, 10L and 25L bottles.

• 5L: £38.00
• 10L: £70.75
• 25L: £169.00

When you need it

• You are closing the pool for winter.
• Last spring opening produced green or scaled water.
• Pool sits under a cover for 4-6 months.
• You want a single one-shot winterising dose.
• You need a low-maintenance winter chemistry routine.

How to use

1. Wait for water below 12 C before final winter dose.
2. Shock pool to 10 ppm with cal-hypo first; wait 4 hours.
3. Test pH 7.2-7.6 and TA 80-120 ppm; balance if needed.
4. Dose 200 ml per 10 m³ of winteriser as one-shot.
5. Pre-dilute in 10 L bucket of pool water.
6. Pour evenly around perimeter with circulation on; run filtration 4 hours; drain pipework; fit cover.

Dosing guide

One-shot dose at close-down. Do not redose mid-winter. Combine with pipe antifreeze for full winter protection.

• For 20 m³, add 400 ml to reach Winter close-down.
• For 40 m³, add 800 ml to reach Winter close-down.
• For 60 m³, add 1.2 L to reach Winter close-down.
• For 100 m³, add 2.0 L to reach Winter close-down.
• For Heavy historical algae, add 1.2 L for 40 m³ to reach Lift to 30 ml/m³.

How it works

Concentrated winterising blend of polyquat algaecide, scale inhibitor and pH buffer at typically 30-40% w/w combined actives.

Polyquat fraction prevents algae growth at near-freezing temperatures; phosphonate scale inhibitor binds calcium so it cannot deposit; carbonate buffer holds pH steady through winter drift.

Pools left untreated through winter develop green water, scale and stained plaster. A single winteriser dose at close-down replaces 3 separate winter chemicals and prevents the spring opening problem.

Frequently asked questions

When do I dose?

At close-down once water temperature drops below 12 C and you have shocked to 10 ppm chlorine.

How much per m³?

20 ml per m³ as a one-shot. For a 40 m³ pool that is 800 ml.

Can I use this instead of separate chemicals?

Yes. Replaces winter algaecide, scale inhibitor and pH buffer in one product.

Pack sizes?

1 L, 5 L drums.

Do I still need pipe antifreeze?

Yes. Winteriser protects water; antifreeze protects pipework. Both are needed.

Is this just polyquat?

No. Combined polyquat + scale inhibitor + pH buffer. Dedicated winter algaecide is polyquat alone.

What are the active ingredients?

Polyquat algaecide, phosphonate scale inhibitor, carbonate pH buffer; combined 30-40% w/w.

Why combined?

Single dose, single mix-down, single application; standard practice in commercial pool closure.

Will it stain plaster?

No. Phosphonate is colourless; polyquat is non-staining; buffer is salt.

Spring algae?

Brush, shock, vacuum dead algae to waste; rebalance chemistry.

Scale at opening?

Apply tile cleaner; descale heater per manufacturer.

Winteriser vs winter algaecide?

Winteriser is the all-in-one closure pack; winter algaecide is polyquat or copper alone. Winteriser saves money on combined dose.

Winteriser vs pipe antifreeze?

Different jobs. Winteriser is for water chemistry; antifreeze prevents frozen pipework. Always use both.