Blusyp

Blusyp: under-sink water filtration for UK homes

Blusyp is an online retailer of domestic water filtration equipment. Its catalogue centres on a single main product, the Blusyp Under Sink Water Filter, a three-stage system that connects to the kitchen tap supply and is positioned as a compact alternative to jug filters or whole-house treatment. The company also sells the replacement cartridges that the system requires.

The site presents the filter as a do-it-yourself installation: the package includes an installation guide, the three-stage filter unit, an inlet hose connection with screws and plumber tape. No professional plumbing is required according to the product description. The unit measures 32 cm in height and 30 cm in width, dimensions the company says are intended to fit under most kitchen sinks.

How the three-stage filtration works

According to the product information, the system combines activated carbon, a fluoride-reduction medium, anti-scale components, silver-ion antibacterial protection and a sediment layer. Blusyp states that this arrangement reduces sediment, chlorine, unpleasant taste and odour, and a wider set of contaminants. The specific reduction figures published on the site are:

• 99% of PFAS
• 99% of viruses and bacteria
• 99% of microplastics
• 99% of limescale
• 99% of chlorine
• 80–99% of fluoride
• 99% of pesticides

The FAQ adds that the filter reduces up to 99% of fluoride, chlorine, PFAS/PFOS, VOCs, microplastics, limescale, bacteria, heavy metals including lead, and unpleasant odours. The product page also lists rust, sand, heavy metals, chlorine, fluoride and bad odours among the contaminants addressed.

Certification and testing claims

Blusyp describes the under-sink system as certified to NSF/ANSI Standards 42 and 53. The product text states that the filter is independently tested by its manufacturer to ensure reliable performance and safety. The same page positions the system as suitable for drinking, cooking and food preparation, and as an option for families looking for certified water purification with minimal maintenance.

Cartridges and replacement schedule

The shop lists three replacement cartridges, each priced at £34.99. They are identified by colour and model number, with different replacement intervals:

• Green cartridge, model 1 PP, replacement cycle of 6 months
• Yellow cartridge, model 2 CK, replacement cycle of 8–12 months
• Red cartridge, model 3 CB, replacement cycle of 12–18 months

At the time of writing, the cartridge listings shown on the site were marked as sold out. The main filter unit was listed at £79.00, with taxes included and shipping calculated at checkout.

Customer feedback and published reviews

The site displays a customer reviews section attributed to Trustpilot, with individual comments dated between October and December 2025. The reviewers describe the unit as fitting neatly under the sink, taking up little space, being easy to install in about 15 minutes, and producing water that tastes cleaner and fresher. The product page also shows an aggregate of one review for the under-sink filter. These are user comments reproduced by the company and are not an independent assessment by this directory.

Online store and practical information

Blusyp operates through its own online shop, with sections for the product, cartridges, blog posts and an installation guide. The site accepts a range of payment methods, including American Express, Apple Pay, Diners Club, Discover, Google Pay, Klarna, Maestro, Mastercard, PayPal, Shop Pay, Union Pay and Visa. The company publishes a telephone number and an email address for contact, and maintains a newsletter subscription form. Its blog includes articles on why a three-stage under-sink filter may be useful and on what can accumulate in water pipes.