Karlsten Spider Killer Spray, 5 Litre

Karlsten Spider Killer is a 5-litre spray formulated with cypermethrin for spider control. The listing claims a residual surface effect of up to six weeks and describes it for indoor and outdoor use, making the large container more suited to treating broader areas than occasional spot use.

At a glance

The listing identifies cypermethrin as the active ingredient and gives HSE 10668 as the specification met.
A 5-litre volume is offered for treating larger areas or repeated applications.
The listing claims up to six weeks of residual effect on treated surfaces and indoor and outdoor use.

Price

£29.32Save 15%

Reference price: ~~£34.50~~

Price checked: 12 Nov 2026

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Pros and cons

Pros

The 5-litre volume is suited to buyers covering extensive areas rather than seeking a small ready-to-use quantity.
The listing states a residual effect of up to six weeks on surfaces.

Technical specifications

7 specifications

Identity
Brand	Karlsten

Product details
Form	Spray
Liquid volume	5000 Millilitres
Target species	Spider
Active ingredient	cypermethrin
Specification met	HSE 10668
Country of origin	United Kingdom

What to know before buying

Listing details to confirm

The listing gives differing performance timeframes: up to six weeks on surfaces, 60–120 seconds for contact killing, and elsewhere says one application lasts for months. Customer feedback also varies on spider-killing effectiveness and duration, so these claims should not be treated as assured outcomes. Follow the product label for application and use conditions.

Who is it for?

A good fit for

Households, offices or commercial premises wanting a large-volume spider spray for broad-area treatment.
Buyers looking for a product listing that names cypermethrin and a claimed residual surface effect.

Less suited to

Buyers who need a compact container for occasional small-area use.
Anyone needing a guaranteed result or duration, as customer reports and the listing’s time claims vary.

Karlsten Spider Killer Spray, 5 Litre · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.4 / 5 · 511 ratings

5 stars71%71%
4 stars13%13%
3 stars10%10%
2 stars3%3%
1 star3%3%

Customer feedback includes reports of effectiveness, including a mention of surface activity for up to six weeks, but experiences with spider killing and duration are mixed. Some say it stops spiders, while others report poor results, and reported duration ranges from around two months to less than six weeks. Value opinions also differ. The favourable aggregate ratings coexist with this variation, so buyers planning extensive treatment should weigh the large 5-litre volume against uncertain real-world consistency and duration.

Positive themes

Some customers describe the product as effective.

Mixed feedback

Reports differ on whether it kills or stops spiders reliably.
Opinions on value for money are divided.
Reported duration varies, with some saying it lasts about two months and others saying it does not last six weeks.

Frequently asked questions

How much product is listed?

The listing specifies a liquid volume of 5000 Millilitres.

How long does the surface effect last?

The title and feature text claim up to six weeks on surfaces, but another feature says one application lasts for months. Customer feedback also reports mixed duration, so treat the duration as unconfirmed.

What is the active ingredient?

The listing names cypermethrin. Follow the product label for safe application and use.

Can it be used indoors and outdoors?

The listing describes it for indoor and outdoor use. Check the product label for directions and any location-specific conditions.