Pentair Big Blue Water Filter Replacement: Easy Steps to Change It

Okay, so, I gotta swap out the water filter in my Pentair Big Blue. It’s that time again, you know? Here’s how I went about it.

First off, I turned off the main water supply to the filter. You don’t want a surprise shower while you’re doing this, trust me. Then I went and opened up the faucet that’s furthest down the line from the filter. This helps let out any built-up pressure in the system.

Next, I grabbed a bucket and stuck it under the filter housing. There’s always some water that spills out, and I didn’t want to mop the floor afterward. On top of the Big Blue housing, there’s this little red button. I pushed that in and held it until water stopped coming out. That’s how you release the pressure.

Finding the Right Replacement

Now, about the replacement filter. I had to double-check the model number of my old one to make sure I got the right kind. Pentair has a bunch of different ones, so you gotta be careful. I found my model number on the existing filter cartridge and wrote it down.

Getting the Old Filter Out

With the pressure out and the bucket in place, I used the wrench that came with the filter housing to unscrew the whole thing. It’s pretty big, so it took a bit of effort. Once it was loose, I carefully pulled the old, gunky filter out. Man, it was dirty!

• Turn off the water supply.
• Release pressure by using the red button.
• Unscrew the filter using a wrench.

Putting in the New Filter

I made sure the new filter was the right way up – there are usually markings to indicate the water flow direction. Then, I popped it into the housing and screwed the whole thing back onto the system. I tightened it with the wrench, but not too tight, just enough to make sure it was secure.

• Put the new filter in the housing, with the right direction.
• Screw it back.
• Turn on the water.

Finally, I turned the water supply back on, nice and slow, just in case. I checked for leaks around the filter housing, and thankfully, there were none. I let the water run through the new filter for a few minutes to flush out any air or loose stuff.

And that’s it! Water’s running clean and clear again. It’s not a super hard job, but you definitely want to pay attention to what you’re doing.

Hope this little walkthrough helps someone out there!