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Alright, so the other day, I had to deal with replacing the filter in my Pentair Big Blue water filtration system. It’s one of those 1-inch NPT jobs. Let me tell you, it was quite the experience, and I figured I’d share my little adventure.

First off, I noticed the water pressure in the house was getting a bit weak. It’s usually a sign that the filter’s clogged up and needs some attention. My system is the Pentair Big Blue, and it’s been a good 10 years, so it is time to change it, I guess. The manufacturer said change it every 10 years, and I don’t want to have a problem later, so just do it.

So, I grabbed my tools and headed down to the basement. The first thing I did was shut off the main water supply. You don’t want water spraying everywhere when you start unscrewing things. Trust me on that one. I use the EPDM O-ring, to prevent water leaking.

Next, I located the filter housing. It’s this big blue cylinder, hence the name “Big Blue.” There’s a pressure relief button on the cap, which is pretty handy. I pressed that to release any built-up pressure inside the housing. This step is crucial; otherwise, you might get a face full of water when you open it up.

Then came the fun part. I used a filter wrench to loosen the housing. It’s a bit of a workout, but you gotta make sure you don’t crack the housing. Slow and steady wins the race, as they say. Once it was loose enough, I carefully unscrewed it by hand. Inside, I found the old, gunky filter. It was definitely time for a change.

I pulled out the old filter. It was heavy and full of all sorts of sediment. It’s amazing how much stuff these filters catch. I gave the inside of the housing a quick wipe down, just to get rid of any residual gunk. Then I grab the new filter. I ordered the Pentair Pentek RFC-BB. It looked good.

I popped the new filter into the housing. Made sure it was seated properly. Then, I screwed the housing back onto the cap. Tightened it with the wrench, but not too much. Just enough to make sure it was snug and wouldn’t leak.

With everything back in place, I slowly turned the main water supply back on. Checked for any leaks around the housing. None. Success! The water pressure was back to normal, and the water tasted great. And I also bought the Pentair Pentek 150234 Big Blue Filter Housing and 150237. Just to make sure that I have a backup.

All in all, it wasn’t too bad of a job. Took me about an hour, and I saved myself a call to the plumber. Plus, it’s always satisfying to do these things yourself. So, if you’ve got a Pentair Big Blue system and you’re noticing a drop in water pressure, it might be time to change that filter. Just follow these steps, and you’ll be golden. Remember, keep that old filter around. You never know when you might need it for parts or as a backup. Better safe than sorry, right?