# Waterdrop T4-A Alkaline Reverse Osmosis Water Filter, 450 GPD

The Waterdrop T4-A is an under-sink reverse osmosis water filter with separate standard and mineral-enhanced alkaline water options. Its listed 450 GPD capacity and tankless design suit buyers seeking on-demand filtration, but installation needs an electrical connection and a drilled countertop tap hole.

- [Original product page](https://bargainpostbox.co.uk/product/waterdrop-t4-a-alkaline-reverse-osmosis-filter)
- [View offer](https://bargainpostbox.co.uk/visit/waterdrop-t4-a-alkaline-reverse-osmosis-filter)
- Market: UK
- Language: en-GB
- Currency: GBP
- Brand: Waterdrop
- Model: T4-A
- Category: Home & Kitchen > Kitchen Appliances > Water Purifiers
- Price: 199.49 GBP
- Previous price: 279.99 GBP
- Discount: 29%
- Price checked: 2026-11-12T15:10:40.694Z
- Rating: 4.6 / 5
- Reviews: 179

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## At a glance

- Two purified water choices are described: standard RO water and a mineral-enhanced alkaline stream.
- The listing describes a tankless, 10-stage system and a 2:1 pure-to-drain ratio.
- Indicator lights and buzzer alerts are claimed for filter-life reminders.
- Stated replacement intervals differ by component, from 6 to 24 months.

## Pros

- Separate standard and alkaline water options give users a choice of mineral-enhanced output.
- Tankless installation avoids storing treated water in a tank and is intended to save under-sink space.
- A 2:1 pure-to-drain ratio is specified, which may appeal to buyers seeking to limit wastewater.

## Cons

- Requires an electrical connection, so it needs a suitable powered location beneath the sink.

## Specifications

### Identity
- Brand: Waterdrop
- Model: T4-A
### Filtration and output
- Purification method: Reverse Osmosis
- Special features: Reverse Osmosis, Advanced Filtration
- Maximum flow rate: 450 Litres Per Day
- Capacity: 450 gallons
### Installation and power
- Installation type: Under Sink
- Power configuration: Corded Electric
### Dimensions and materials
- Dimensions listed: 50L x 40.5W x 23.5H centimetres
- Material listed: Plastic
### Filter replacement
- Filter life cycle: 6 Months

## Before you buy

- The faucet installation requires drilling holes in the countertop. The system also requires an electrical connection.
- The listed 6 Months filter life cycle is not a universal interval. The feature description specifies CF filter: 6 months, RO membrane: 24 months, CB filter: 12 months, and alkaline mineralizer: 12 months.
- The listing gives both 450 gallons capacity and a 450 Litres Per Day maximum flow rate, while the title states 450 GPD. These are differently labelled claims, so confirm the intended output specification for the selected listing before buying.

## In the box

- RO system (Included)
- Filters (Included)
- Replacement filters (Included)
- Main unit (Included)

## A good fit for

- Households wanting under-sink RO filtration with a choice between standard and alkaline mineral-enhanced water.
- Buyers who prefer a tankless system and can provide power and accommodate countertop drilling.

## Less suited to

- Buyers unable to provide an electrical connection or drill a faucet hole in the countertop.
- Buyers who need a clearly established flow rate before purchase, given the differently stated output figures.

## Customer feedback

Customer feedback describes the unit as good quality and says the water tastes good, while reported experiences with water flow are mixed, including disappointment. That matters for buyers prioritising dispensing speed: the listing gives a high daily capacity claim, but it does not establish how quickly water will flow in a particular installation.
- Positive themes: Customers report good water taste and positive impressions of product quality.
- Mixed feedback: Customer feedback on water flow is mixed, with some customers finding it disappointing.

## Frequently asked questions

### Does the T4-A provide alkaline water?
The listing describes two options: standard RO-purified water and a separate mineral-enhanced alkaline stream.
### Does this system need electricity?
Yes. It is listed as corded electric, and the feature description says an electrical connection is required.
### What needs checking about the stated capacity?
The title says 450 GPD, while the specifications also list 450 gallons capacity and a maximum flow rate of 450 Litres Per Day. Confirm the intended output figure with the selected listing.
### How often do the filters need replacing?
The listing gives component-specific intervals: CF filter at 6 months, RO membrane at 24 months, CB filter at 12 months, and alkaline mineralizer at 12 months.

## Alternative options

- [iSpring RO400 7 Stage Tankless Reverse Osmosis Water Filter System, 400 GPD \| Reduce TDS, PFAS, chlorine, lead, odours, 2:1 Pure to Drain Ratio, Fast Flow Under Sink RO System with Brushed Nickel Faucet](https://bargainpostbox.co.uk/visit/waterdrop-t4-a-alkaline-reverse-osmosis-filter)
- [Waterdrop G5P700A Alkaline Mineral pH+ Reverse Osmosis Water Filter, 700GPD \| NSF/ANSI 58 & 372 Certified, 8-Stage RO Water Filtration System, 2:1 Pure to Drain, Tankless RO System with Smart LED Faucet](https://bargainpostbox.co.uk/visit/waterdrop-t4-a-alkaline-reverse-osmosis-filter)
- [iSpring RO500AK Alkaline Mineral pH+ Reverse Osmosis Water Filter, 500 GPD \| NSF/ANSI 58, Reduce TDS, PFAS, 2:1 Pure to Drain Ratio, Tankless Under Sink RO System, Brushed Nickel Faucet, Auto-Flush](https://bargainpostbox.co.uk/visit/waterdrop-t4-a-alkaline-reverse-osmosis-filter)
- [Waterdrop 10UA Under Sink Water Filter System, 11000 Gallons Capacity \| Reduce PFOA/PFOS, Reduce Lead, Chlorine, Bad Taste, Odor, NSF/ANSI 42 Certified, Direct Connection to your Faucet](https://bargainpostbox.co.uk/visit/waterdrop-wd-10ua-under-sink-water-filter)
- [Waterdrop G3P600 Reverse Osmosis Water Filter System, 600 GPD Tankless RO \| NSF/ANSI 42,53,58&372 Certified, Reduce TDS, Scale, Better Taste, 2:1 Pure to Drain, Water Softener, Smart LED Faucet](https://bargainpostbox.co.uk/visit/waterdrop-t4-a-alkaline-reverse-osmosis-filter)
- [iSpring RCC7P-AK Reverse Osmosis System, 6-Stage, 75 GPD, pH+, with Pump \| Under-sink system with alkaline filter. TDS reduction. RO drinking water filtration.](https://bargainpostbox.co.uk/visit/waterdrop-t4-a-alkaline-reverse-osmosis-filter)
- [iSpring RCC7AK Reverse Osmosis System, 6-Stage, NSF Certified, 75 GPD, pH+ \| Alkaline system with pH+ remineralization. Under-sink installation. Patented top-mounted faucet for easy installation](https://bargainpostbox.co.uk/visit/waterdrop-t4-a-alkaline-reverse-osmosis-filter)
- [iSpring US31 3-Stage Under Sink Water Filter System, NSF/ANSI 58 Certified \| Reduces Sediment, Chlorine, Heavy Metals & Odor, Tankless High Capacity with Metal Faucet](https://bargainpostbox.co.uk/visit/waterdrop-t4-a-alkaline-reverse-osmosis-filter)
- [Waterdrop 15UA Under Sink Water Filter System, 19000 Gallons for 2 Years \| Reduce PFAS, PFOA/PFOS, Lead, Chlorine, Bad Taste, NSF/ANSI 42 Certified, Direct Connect to Original Faucet](https://bargainpostbox.co.uk/visit/waterdrop-wd-15ua-under-sink-water-filter)

## Add-ons

- [Waterdrop RT-2CFCBALK Filter, Replacement for T4-A Tankless RO System \| Includes two 6-Month CF filters, one 12-Month CB filter, and one 12-Month ALK filter, 1-Year Combo](https://bargainpostbox.co.uk/visit/waterdrop-t4-a-alkaline-reverse-osmosis-filter)

## Images

![Waterdrop T4-A Alkaline Reverse Osmosis Water Filter, 450 GPD — 1](https://bargainpostbox.co.uk/i/j7-ICXHIpvdir3juHidoyoJKh5k56ikOQY0qlYShfdCQgmhhuu9LbvDjDDorCd7BKbFzAnKnsm0aYbd7oTD-2wTgKkCatrY5VHuQXbWCIFc10ZIF7-qE.jpg)

![Waterdrop T4-A Alkaline Reverse Osmosis Water Filter, 450 GPD — 2](https://bargainpostbox.co.uk/i/Y-Kb19i8Ljs11BLRAMPvNoEtzUGV99vLSIZP91jmhZ1jGpNQMWKCqZuuf_yO8Vv5xG-dZelvAC57JXxVKMQGi5PwesYjLLU2dI1UBZJ0PPfUwlnEP9P5.jpg)

![Waterdrop T4-A Alkaline Reverse Osmosis Water Filter, 450 GPD — 3](https://bargainpostbox.co.uk/i/GlrJwrt_b7I4ut5d6uYKdUHEbwbAA00i2a7VWAkAoZxQUvYhQYxguK9OnwIpTfH1AYicRsf3u8VoQQpuUD4RX9yGt0cYTL5PZJfcn2uvihE_pML-Y8Lp.jpg)

![Waterdrop T4-A Alkaline Reverse Osmosis Water Filter, 450 GPD — 4](https://bargainpostbox.co.uk/i/DVSU5UtfAwVVhFaba4mz5GH-2N_o2gYLthHUMZn6tVeMM7kaNsCNTsH__vjYU4WpWqu-Yf1hZLksDIaFXKUUQ1L5t5odqg56BjM8BPnFB_JFSp-4tW9m.jpg)

![Waterdrop T4-A Alkaline Reverse Osmosis Water Filter, 450 GPD — 5](https://bargainpostbox.co.uk/i/3Nkh9dmCsC7LgtpGlV_fno1B5RTgOmPEmYAYYOd2kWU77KwAdCLzcypopoqbI6SkqhKgAHwFd5ZzGFn1p4O8haSZSDGE-b4YskoxLXv8EkoSdIqyxAhg.jpg)

![Waterdrop T4-A Alkaline Reverse Osmosis Water Filter, 450 GPD — 6](https://bargainpostbox.co.uk/i/9dF1ZqzjS_U34H3bxXl4iZQsv_Rdfp66t0YwVfA1SOJFbq3Cv8vaGkvxJkJru7l93SZ36pvgilp8A2_0fTSS_pGSStLoyS_USVg7JhveYjJhHBziuLlf.jpg)

![Waterdrop T4-A Alkaline Reverse Osmosis Water Filter, 450 GPD — 7](https://bargainpostbox.co.uk/i/4q1h7vV1e8Yh546hfb3-QRyAXs84SSq7XpWBYfqBMTzB2Pyz_7Z3io8Dwlwv1fz99bCwtO2JGu4tkHjrc-Xx9JiR8ndY0LpqPZywogLHxVJ9jws4f_Ld.jpg)