Under-sink Filters

Under-sink Filters | Water Purification | Plumbing | Guild

Imagine turning on your kitchen tap and meeting the clean, fresh taste of mountain-spring water—no plastic bottles, no countertop clutter, just pure confidence in every glass. HEP’s discreet under-sink filters slip seamlessly into existing pipework, stripping out chlorine, limescale, micro-plastics and heavy metals while preserving the healthy minerals your body craves. With high-capacity cartridges and food-grade fittings engineered for long-term reliability, this is water purification that feels luxurious yet lives quietly in the background.

Based right here in Guild, our certified plumbers handle everything from tidy, same-day installation to annual filter changes, so you never have to wrestle with tools or guess when it’s time for a swap. Whether you’re brewing barista-level coffee, filling baby bottles or simply cutting down on waste, HEP’s under-sink solution delivers crystal-clear savings, taste and peace of mind—tap after tap, year after year.

FAQs

What contaminants does an under-sink filter remove?

Guild under-sink systems are designed to tackle common municipal and well-water contaminants such as chlorine, sediment, rust, volatile organic compounds (VOCs), heavy metals (lead, mercury), pesticides, herbicides and many unpleasant tastes or odours. Multi-stage models also incorporate carbon block, KDF and occasionally reverse-osmosis membranes to address fluoride, nitrates and cysts like Giardia and Cryptosporidium. Always check the performance data sheet for the exact reduction claims of the cartridge you select.

How often do I need to change the filter cartridges?

Most carbon or composite cartridges last 6–12 months, or 2,000–3,000 litres of water, whichever comes first. Reverse-osmosis membranes typically last 24–36 months. Actual life span depends on your incoming water quality and daily usage. Guild systems include a date wheel sticker and optional smart-monitor to remind you. Neglecting timely replacement can lead to flow restriction, bacterial growth and reduced contaminant removal.

Will installing an under-sink system reduce my water pressure?

A properly sized under-sink filter has minimal impact on normal tap flow. You may notice a slight drop (around 0.2–0.4 bar) because the water is forced through fine filtration media. If your household already has low pressure, choose a high-flow cartridge (rated 8–9 L/min) or a reverse-osmosis kit that includes a pressurised holding tank to maintain adequate delivery.

Can I install the under-sink filter myself or do I need a plumber?

Guild units are supplied with push-fit connectors, colour-coded tubing and an isolation valve, allowing most DIY-minded homeowners to perform installation in 30–60 minutes with only an adjustable spanner and a drill for the dedicated faucet. However, if you are uncomfortable cutting copper or PEX lines, or if local regulations require a licensed professional, hiring a plumber is advisable. Professional installation also preserves warranty coverage in some jurisdictions.

What is the difference between a single-stage and multi-stage under-sink filter?

Single-stage units contain one cartridge—usually carbon block—that focuses on chlorine, taste and odour. Multi-stage systems stack two to five cartridges in sequence. A typical three-stage layout is: 1) sediment pre-filter to capture particles, 2) carbon/KDF blend to remove chemicals and heavy metals, 3) granular activated carbon for final polishing. Reverse-osmosis versions add a semi-permeable membrane and post-carbon stage. The more stages, the broader the contaminant coverage and the longer each cartridge lasts, but the upfront cost and under-sink space required increase accordingly.

How do I know when the system needs maintenance or replacement?

Warning signs include noticeably slower flow, a return of chlorine taste or odour, and after-taste issues. Many Guild models feature a built-in LED that counts water volume and flashes red when cartridges reach end-of-life. Annual sanitisation of the housing with food-grade hydrogen peroxide is recommended during cartridge changeovers. Inspect O-rings for wear and replace them if flattened or cracked to prevent leaks. The plastic filter housings themselves typically last 5–7 years before being swapped for new ones.