Instructions for Swapping Out a Filter Cartridge


Instructions for changing the cartridge in a household water purifier. Changing both filters on an Aquasana AQ4000 filter system is covered here.

Any filtration system brand could benefit from some of the advice given here. Take the filter replacement kit out of its packaging and examine its contents. A and B replacement cartridges for the water filter should be on hand. A pair of new O-rings. If the O-rings are not flat, you can leave them out overnight to see if they flatten out on their own. If it doesn’t work, try sleeping on them with a heavy book. If the O-rings are bent during transport, creating a tight seal will be more challenging.

Your home water purifying system must first be laid on its side. The filter caps are clearly labeled with the letters A and B. There are also arrows showing which way to turn the caps off. To remove filter cap A, turn it counterclockwise or toward the arrow. The arrow on filter cap B indicates that it should unscrew to the left. They need to be no tighter than the hand. If you need more leverage to remove them by hand, pliers handles will do the trick. The water supply lines (both in and out) must be handled with extreme care.

Replacing cartridge A in the water filter will be the most challenging. The cartridge stays in the filter thanks to the seal on top. The filter housing is too small for easy access. To remove the filter, I grab it with a pair of pliers, twist, and pull. The filter cap will be changed to accommodate water filter cartridge B. You may separate them by twisting and pulling. I spread them out on both sides of the filter case. This aids in distinguishing between filter A and filter B. Please take off the two o-rings and clean the groove where they rest. Replace the old O-rings with the new ones. Lubricate the exposed part of each O-ring with a food-safe silicone-based lubricant. This is useful for setting up the filter caps. The oil makes it simpler for the caps to slip onto the rubber, which improves the seal. They may kink and become dislodged if installed without water, leading to leaks.

Cartridge A, a replacement for the water filter, is white. Put the O-ring end into the A cartridge housing first. The rubber seal goes in more smoothly after being wetted. Turn it around and give it a push to get it situated. The blue cartridge is the one to use for the B replacement. Replace the filter cap’s O-ring. Identically to how the other filter works. I now verify that the O-ring is securely fastened. After that, place the B filter into the B housing. Make sure the B cap is securely fastened. Make sure the other seal is intact and securely seat the A cap.

Don’t forget to tilt the filtration system, turn on the water, and flip the diverter valve open. Look for moisture around the cap threads to indicate a leak. Tightening the cap can help with the slight leak. If that doesn’t stop the drip, remove the cap and see whether the O-ring moved. Please make sure there are no tears or nicks in it. If so, the previous O-ring seal may be restored. Another choice is to visit a hardware store with one of the outdated seals so that it may be matched up. If none of these solutions work, you can try installing a new seal. The cap can be replaced after making sure there are no leaks.

If there are no visible signs of leaking, If you want clear water, turn on the AQ-4000 and let it run for two or three minutes. It’s typical for the water to appear hazy or even black initially. The fresh filter cartridges are getting the carbon dust cleaned out of them. When the filtration system needed to be flushed, I would store the water. Water any indoor plants or outdoor plants you have. Remember when you need to replace your water filter cartridges. Put a piece of tape on the filter with the replacement due date written on it. This is useful for keeping track of the time. The filters in a home water filtration system must be changed every six months or 500 gallons, whichever comes first.

Fincher, Frank Having worked with water filters for 20 years, from those in industrial ice makers to those in swimming pools.

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