How to Change Pentek Big Blue Filter (Easy Steps for Beginners)

Okay, here is my sharing about how to change the Pentek Big Blue filter:

So, the other day, I noticed my water pressure was kinda low. It’s happened before, and usually, it means my whole house water filter is clogged up again. I use one of those big blue Pentek ones, so I figured I’d share how I swap out the filter ’cause it’s really not that hard.

First, I gotta shut off the main water valve to my house. I found it in the basement, near where the water comes in. Turning that big handle clockwise does the trick. This is important, or you’ll have a big mess.

Next, I relieve the pressure in the system. To do this, I go and turn on a few faucets around the house. Nothing much comes out since the water is off, but it lets out any built-up pressure.

Now for the filter housing. Mine has a little red pressure release button on top. I push that and hear a little hiss. Then I gotta unscrew the big blue housing. It’s pretty big, so I use this plastic wrench thingy that came with it. It gives me the needed grip. If it’s really tight, I try warming it up a bit with a hair dryer, not too much, but just to loosen it up.

Once it’s loose, I turn it by hand. Important tip: I place a bucket underneath to catch any water that spills out. I unscrew it completely, and it’s heavy, so watch out! I dump out the old water and take out the old, nasty filter. You wouldn’t believe how much gunk it catches. Nasty.

Before I put in the new filter, I clean out the housing. Just some mild soap and water. And I also check the big O-ring. If it looks worn or cracked, it’s time to replace it. Mine was okay this time, so I just put a little bit of silicone grease on it to keep it in good shape. It helps to get a better seal.

Now, I pop in the new filter. It’s pretty obvious which way it goes. It only fits one way. Then I screw the housing back on. I hand-tighten it first, then use the wrench to give it a final snug turn. Not too tight, just enough so it won’t leak.

Almost Done!

Now, I slowly turn the main water valve back on, watching for any leaks around the filter housing. If I see any drips, I’ll tighten it a little more with the wrench. If it’s all good, I’ll let the water run for a few minutes to flush out any air or loose stuff from the new filter.

• Turn off the main water supply.
• Relieve the water pressure.
• Unscrew the filter housing.
• Remove the old filter and clean the housing.
• Insert the new filter.
• Screw the housing back on.
• Turn the water back on and check for leaks.

And that’s it! Water pressure is back to normal, and I’ve got clean water again. It’s a pretty simple DIY job, and it saves me from calling a plumber. Plus, I feel pretty handy afterward. Hope this helps someone out there!