8 Whole House Water Filter Buying Tips

If you notice that your appliances and water systems at home are starting to rust quite easily or have corrosion and sedimentary deposits building up somewhere, then that means you need a whole-house water filter.

This inexpensive and useful device filters water from your plumbing before it goes to your water heater, sink, washing machine, shower and other parts of your house.

But before you jump up and go buy one, here are 8 things you absolutely have to know:

1. Whole house water filters usually fit 3/4” pipes.

whole house water filter

Standard plumbing in your area and in your house should fit most whole house water filters.

However, if you have different plumbing specs used for your house or you live in an area where you had to do the plumbing yourself, you may have used different pipes.

Make sure the whole house water filter you buy is compatible with your home plumbing. If it isn’t, there are ways to adapt it to your pipes—but you’d have to ask a professional plumber.

2. It isn’t a plug-and-play device.

Sadly, even if you do have an instruction manual or demo video, you still need a professional plumber to install this.


Some models need special bracing and bracketing to be installed. What’s more, the plumber has to show you how to change filters on the device. You do have to change the filter based on the manufacturer’s instructions.

3. This type of filter only takes out certain substances.

house water filters

While the device does say it’s a water filtration system, keep in mind that it does not necessarily make water potable.

This is an especially important thing to know for people who source water from the wild instead of city or community plumbing.

Most whole house water filters only filter out rust, sediments and dirt. These devices don’t get rid of parasites, toxins and other microscopic substances and minerals in the water.

This type of filter cannot handle fluoride, chloride, Giardia and other similar substances in the water. This device is more of a physical filter than a purification device.

 the full water filters  kit

4. Some kits may not be prepared for full installation.

Depending on the brand that you’re looking for and what the product includes, you may or may not be able to install the device in your home out of the box.

Even when you get the full kit, your home plumbing may also not be ready to take the device without a few gaskets, O-rings and brackets. You really do have to call in a plumber to take a look for the best place to install the whole house water filter and what the most secure installation should look like.

5. You can decide the filtration level of your device by buying and installing different filters.

This device is a bit more versatile than a water distiller and purifyer. You can actually control the the level of filtration the device performs.

According to users and experts, the smaller your filter, the more sediments and substances it can keep out. The problem here, is that these filters tend to wear out easily and would need replacing much sooner than other larger filters.

While larger filters do last longer, they may not filter out everything you want to keep out from your water.

6. Filters typically last for about three months.

Knowing how often you need to replace your filter lets you compute for the cost of your device. In essence, the cost of your filters essentially factors in to the cost of your water utility expenses every month.

If after a month your filter already needs replacement, then you may be doing something wrong. the installation of your device may be problematic. Your filtration device may also not be enough to handle the water you’re sourcing.

Take note of compatible filters and which ones users recommend. Here are some of the best filters in the market according to certified users of most whole water filters:

7. Some units cannot handle hot water.

 limit on the water it can filte

If you’re using this unit for your business or if you can only source hot water, you may be in trouble.

Some brands like the Watts and Dupont basic whole house filter systems cannot handle hot water because there is a 105 degree Fahrenheit limit on the water it can filter. Using water that is too hot can damage the device and filter, which just means you need to buy another system.

8. You can’t install whole house filters outdoors.

Another constraint for this device is that you cannot put this outside your home.


For the same reason as the fact that you cannot use this filter on hot water, you cannot use this device outside of your home especially if you have intense winters that can freeze the water in the device.

 teach you how to change filters

Also, if you cannot guarantee that the device won’t freeze inside your home, you may have problems with using it as well.

If your device becomes frozen or too hot, you may damage the device and have to purchase a new one.

Buying a whole house filter is no joke, and its far from being a walk in the park. You definitely need a plumber to help you install the device and to teach you how to change filters.

If it’s possible, you should also have a plumber look at your pipes and home and at the products you’re looking at.


Thank you for visiting AllAboutWaterFilters. When you purchase through site links on our site, we may possibly earn an affiliate commission, at no extra expense to you. Please be sure to enjoy our website!