Please note: This page may contain affiliate links. If you buy a product or service through such a link we earn a commission at no additional cost to you. Learn more about our product review process or check our FTC affiliate disclosure.
Is it possible for you to make your own DIY whole house water filter in order to save money, and if so how? Also, are there any drawbacks to this? What are the things that you have to consider? Where do you even start?
We are going to answer these and many more questions in the following article. Ready to take on your next DIY project? Let’s go!
A Word of Caution:
Many of the DIY water treatment methods that you can read about online might be suited for emergency situations where clean water is inaccessible. However, they don’t provide a healthy drinking water solution in the long run for two reasons:
Bottom line: NSF-certified filters are still the best way to ensure that the water in your home is clean and safe.
It’s time for you to learn how you can build your own whole house water filtration system. First, we will get into the benefits of having your water tested before we even start thinking about what your perfect system could look like. Then you get a list of tools and other components that are required. And finally, you will learn how to set everything up step by step.
It’s simple: You cannot know what filtration requirements you have without knowing the condition of your water. This is why it’s always a good idea to have your water professionally tested.
It also makes a difference if you are on well or city water. Most city waters, for example, contain either excess chlorine or chloramine used for disinfection. Well water on the other hand might contain large amounts of sediment, iron, manganese and hardness minerals.
Bottom line: If you want to make sure that you get the cleanest and safest water possible, conduct the testing first so that you know what you are dealing with. Then you can choose filtration components accordingly.
It goes without saying that you have to have some very basic plumbing skills for this to work. Or at least you should be somewhat handy with tools – everything else you can learn by doing.
Oh, and a little bit of patience wouldn’t hurt either…
Other than that, here is a list of tools and accessories that you will need:
The basic idea is to take multiple separate whole house filters and connect them in series. Thereby you can choose between housings that can accommodate 10″ or 20″ cartridges that are either 2.5″ or 4.5″ (big blue) in diameter.
These are industry standard sizes meaning that almost every company on the market has cartridges made that fit these housings. In other words, they are interchangeable. This has 2 benefits:
Thus you want to stay away from proprietary filters and housings. They won’t fit anything else so that the manufacturer can charge a lot more for them.
By the way, the larger the filter size, the greater the maximum flow rate. 2.5″ x 10″ might provide 5 gallons of filtered water per minute which is usually not sufficient for whole house use.
With 2.5″ x 20″ you can about double that flow rate. 8-10 gpm should be enough for larger homes with 2-3 bathrooms. If you want to go even bigger than that, opt for 4.5″ x 20 (10)”.
A bigger filter also has the advantage that it requires less frequent replacements.
Whatever filter(s) you go for, it’s always best if they were tested and certified against NSF Standards (42 and/or 53) which guarantees filtration effectiveness.
Step-down filtration is for applications with multiple (sediment) water problems. For instance:
You can use 3-stages of filtration starting with a 20-micron sediment pre-filter, followed by 5-micron and lastly a 1-micron filter stage.
The pre-filter will trap larger particles to protect all subsequent filter stages from clogging prematurely. If you are on a well supply, you might have to start with a 50-micron pre-filter to remove sand, dirt and rust before everything else.
1 micron is a thousandth of a millimeter. As you probably have already guessed, a filter rated at 1 micron can also capture particles down to a size of 1 micron, such as bacteria. Thus a smaller micron rating indicates a more thorough filtration.
The dilemma: The smaller the micron rating, the lower the water flow rate. Now keep in mind that a whole house filter has to provide enough water for your entire home. Therefore, sufficient water flow is mandatory unless you don’t mind a drop in pressure when using multiple water outlets at the same time. What’s more, each additional filter will contribute to the flow/pressure decrease.
You can also mix in 1 or 2 activated carbon filter stages for improved water taste & smell (and safety) – in fact that’s what we recommend. You have the choice between granular carbon and a carbon block filter. Both are great at removing chemicals like chlorine and its byproducts. They also help with other natural and synthetic compounds – think pesticides, heavy metals such as lead, chromium, arsenic, nitrates and so on.
If your city supply uses chloramine instead of chlorine for water disinfection, regular activated carbon won’t suffice. A much longer contact time would be required to achieve noteworthy results, which is problematic for whole house applications. That’s where catalytic carbon comes into play. We like to call it carbon on steroids. It can effectively eliminate chloramine and chloramine by-products and just like regular carbon also reduces THMs and VOCs.
Do you receive water from a private well? Then you might require a specialized iron/manganese filter or a softener to tackle water hardness. In some cases, well water is also polluted with chemicals and microorganisms from agricultural runoff. Unfortunately, we can’t give you more advice than that without knowing your water situation.
Have you changed your mind? That’s okay! Check out our reviews of the best whole house filter systems.
A shut-off valve before and after the filter setup allow for easier cartridge replacements. And whenever you have to service your system you can simply open the bypass so that your family still has access to water in the entire house.
Pressure gauges allow you to measure pressure before and after your filter chain. If you notice a significant drop it’s time to replace one or more of the cartridges.
Especially if you are on a private well, a sediment pre-filter has to do a lot of initial work to remove the larger contaminants from your water. As a result, it will clog up quickly and require more frequent replacements.
This is not only inconvenient, you will also have to keep a stock of replacements cartridges or order new ones on a regular basis, both at additional cost.
So consider adding a drain line connection to your sediment filter(s) for backwashing. This way, any trapped sediment that accumulates over time will be discharged out of the filter body. However, this does not work with all types of sediment filters, such as solid propylene block filters. Pleated ones on the other hand are fine.
Using an automated timer-based valve that opens for a minute or so each day even allows for self-cleaning. All that is left for you to do is check the batteries every once in a while – it doesn’t get any more convenient!
The setup itself is pretty straightforward. Because we’ve already covered how to install a whole house water filter here, we won’t go into great detail about it now. Just a couple of hints:
On top of that, you can find many helpful installation videos on YouTube:
If you have any questions about how to make your own whole house water filter, please don’t hesitate to leave a comment below!
Sign up to join 1,000+ subscribers and get notified about new BOS guides & checklists as well as exclusive product sales and discount codes.