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APEC WFS-1000 3 Stage UnderSink Water Filter

APEC WFS-1000 3 Stage Under Sink Water Filter Review

The APEC WFS-1000 was the top overall pick in our best under sink water filters guide

We choose it as the top pick because of its excellent filtration performance, the heavy-duty build quality, and easy DIY installation.

We are not the only ones who think it’s a great water filter. It has a high rating on Amazon with 90% of reviewers giving it 4 and 5-star ratings.

Read our full review to find out whether this is the right under counter water filter for your needs.


  • High performance 3-stage water filtration.
  • Comes complete with an installation kit, including a lead-free chrome faucet.
  • Excellent build quality – guarantees durability.
  • High water flow rate.
  • Easy DIY installation.


  • Doesn’t remove TDS and microbes – not ideal for well water.
  • Cannot filter hot water.

Product Specifications


  • Dimensions: 18 x 12 x 10 inches
  • Number of stages: Three (sediment pre-filter and two carbon filters)
  • Filter capacity: 12 months (gallon capacity not specified)
  • Type of water: Chlorinated city water
  • Contaminants removed:sediment, heavy metals, chlorine, herbicides, pesticides, VOCs, mold and algae.  
  • Contaminants not removed:Microbes and total dissolved solids like magnesium and calcium.
  • Installation: DIY
  • Warranty: 1 year

Filtering Performance


Like most under sink water filters, the APEC WFS-1000 consists of three filtration stages to provide the best filtration performance.

Polypropylene sediment filter: The first filter removes sediment and other suspended particles from water. This clears up the water and prolongs the life of the other two filters.

Dual carbon filters: The WFS-1000 uses two carbon blocks to increase performance. The two filters remove almost all the chlorine from water as well as VOCs and organic chemicals.

The result is water that tastes as fresh and looks as clear as bottled water.

So if you are looking for a filter that can replace your weekly bottled water purchases, the APEC WFS-1000 is a great choice.

Chloramine Removal

Despite having two activated carbon filters, the APEC WFS-1000 still cannot filter out chloramine from water.

If you live in of the few cities that use chloramine instead of chlorine to treat water, find another filter that’s designed to remove chloramine.

TDS and Heavy Metals Removal 

These are the two other groups of substances that the WFS-1000 does not remove.

TDS refers to total dissolved solids and includes substances like iron and magnesium often found in plenty in well water.

Because they pass right through the three filters, the WFS-1000 is not ideal for homes that receive well water.

It will not prevent scale or stains caused by dissolved minerals.

According to the manufacturer, the filter also doesn’t remove heavy metals like lead or copper. This is surprising considering that most carbon water filters can remove some heavy metals like lead and mercury.

Microbes Removal 

In addition to dissolved minerals and heavy metals, the WFS-1000 does not remove waterborne microbes.

This is not surprising.

Only UV, reverse osmosis and ceramic filters can remove or neutralize bacteria and other microorganisms.

Filtering Hot Water 

Some carbon filters are fine filtering hot water, but most can get damaged if they come into contact with water above a certain temperature.

In the case of the WFS-1000, the max water temperature is 100 F.

The manufacturer warns against connecting the unit to a hot water source. You should only connect it to your cold water line.

This means you cannot filter hot water, another major limitation of this filter.

1-Year Filters 

Each of the three filters has a lifespan of 12 months, similar to most other under sink water filters.

APEC does not provide the specific gallon capacity for the filters. But given the 1-year lifespan, I’d say they have a capacity of around 1,000-2,000 gallons.

There is no filter life indicator so, you just have to remember to replace the filters at the 1-year mark.

Installation & Maintenance

APEC WFS-1000 3 Stage Under Sink Water Filter

The WFS-1000 requires its own dedicated filter. That means you have to drill a hole in your sink if it doesn’t already have one.

Overall, it takes a bit of time to install the WFS-1000, but it’s easy. Even with the hole drilling, you can still complete the set up yourself.

To make your work easier, the filter comes with a complete installation kit. This includes all the fittings you’ll need to connect the filter with your cold water line.

A lead-free chrome faucet is also included.

You don’t have to buy anything at the store.

Note: The fittings included are designed for use with standard plumbing. If you have non-standard plumbing, you might have to buy your own fittings.

One thing you’ll notice about the filter and different component is their above average quality. Everything feels well made and likely to last for years without breaking or wearing.

Part of the reason the filter has such good build quality is that it is made in the USA. It does make the WFS-1000 a bit pricier than comparable water filters, but the quality is the best.

You’ll be using this filter for years without worrying about leaks or rusting.


The only thing you need to do in terms of maintenance is to replace the filters every 12 months.

That’s easy; it should take you no more than 15 minutes.

Remember there is no filter replacement reminder so keep track of how long you’ve been using the filter and get a replacement in time before impurities start getting through.

Note that the 12-month recommendation is just an estimate. If your water contains a high level of sediment and other impurities, the filters will not last that long.

Replace the filters as soon as you notice a drop in water quality.

Here are couple of other maintenance recommendations:

  • Replace the O-rings after 3-5 years.
  • Replace the filter housings every 10 years.

What We Like The Most About The APEC WFS-1000 Under Sink Water Filter


This is the only under counter water filter we have reviewed with dual carbon filters. It’s better than other filters at removing chlorine and other chemicals from water.

If your main concern is an unpleasant odor and taste in your water, this is the best under sink water filter.

We also love the straightforward installation process. You do have to install an extra faucet but it’s not that hard as long as you have the right tools.

The installation instructions are very detailed and you can always contact customer support if you have a problem.

The excellent built quality is also worth a mention.

Under sink water filters are not known for their longevity. Most use low quality plastic housings and cheap connectors that break and leak easily.

The WFS-1000 is made in America and it shows. The heavy-duty plastic housings are designed to last a full decade. The O-rings, which are very problematic in most filters, easily last 3-5 years.

As I mentioned, the WFS-1000 is more expensive than comparable models but you are paying extra for quality and durability.

What We Don’t Like About This Water Filter

3 Stage Under Sink Water Filter

The filter does what it is mean to do –which is removing chlorine, sediment and chemicals –really well. But it has plenty of limitations.

  • It does not remove total dissolved solids, making it less than ideal for well water.
  • It does not remove microbes, meaning you can only use it with chlorinated city water (to be fair, most non-RO under sink filters do not remove microbes).
  • It does not filter hot water.
  • It does not remove heavy metals.

Another issue is installation. It’s easy enough for anyone to do but it’s a bit involving compared to installing a water filter that doesn’t need a dedicated faucet.

If you don’t already have a hole in your sink, you’ll have to drill a new one.

The APEC WFS-1000 Water Filter Is Perfect For You If...

APEC WFS-1000 filter
  • You are looking for a high performance under counter water filter that will improve the taste and smell of your tap water.
  • You want a high quality and low-maintenance under sink water filter that will last for years without any problems.

Avoid Buying This One If You...

APEC WFS-1000 3 Stage Under Sink Water Filter Review
  • Use well water.
  • Want an under sink system that you can hook up to your hot water line.

Our Bottom Line

APEC WFS-1000 3 Stage Under Sink Water Filter

The dual carbon filters make the WFS-1000 stand out among under sink water filters. It’s the best choice for those who want to clean up chlorine and other foul-tasting chemicals from their water.

Though more expensive than other water filters, the APEC WFS-1000 has outstanding build quality that will actually save you money down the road in terms of maintenance and replacement costs.

Ed Carmichael

About the Author Ed Carmichael

Ed is a water specialist in Tampa, FL. He built to help his friends and family learn about DIY solutions to common water quality issues in the home.

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