How to change your pool filter
Pool filters come in all shapes and sizes but for the most part they all come apart the same. Most filter housings come apart at the middle or upper half of the canister. For sake of discussion we will use the Pentair clean and clear filter housing.
We must first begin by making sure the pool is off. Locate the time clock and turn the timer switch to the off position. No water should be moving in the pool and the pump should not be running. Trying to take the filter housing apart while the pump is running will destroy your filter and the housing it is sitting in. Once we have determined the pool is off, we can loosen the pressure relief valve. Unscrewing the PRV will allow the filter housing to empty its water into the pool. This works by gravity, if the pool is in ground. If the equipment is lower than the pool or the pool is an above ground pool you will need to close the intake and discharge valves to relief the water pressure.
Once you have released the pressure you can turn the locking ring counter clock wise (left) until it comes off. Make sure you place the locking ring on a clean surface so no dirt or leaves can compromise the threads when putting the lock ring back on.
Once the ring is off you can begin to pull the top of the filter canister off. Make sure you stabilize the bottom of the filter housing. This prevents breaking or loosening any plumbing while pulling the top of the housing off. If the top of the canister is hard to take off, the o-ring that seals the two parts of the canister together isn’t properly lubricated.
After the top half of the canister has been removed inspect the lid for cracks or signs of failure. Also examine the o-ring for excessive wear, if any black comes off the rubber gasket and gets on your hands it’s time to replace the o-ring. Its best to replace the o-ring every time you replace the pool filter. Now it is time to remove the filter from the housing.
Removing the filter can be tough especially if its dirty. A dirty filter can weigh up to 30 lbs. It’s a very awkward lift and there are no handles to lift from. Lift the filter straight up until it clears the bottom of the filter housing. Make sure it is clear before pulling it to the side this will help keep the bottom of the housing from moving and compromising the plumbing attached to the filter housing. Be sure to match up the old filter with the new one before attempting the install. Never force a filter in the housing or force the lid back on.
Once the filter has been verified make sure it is out of the packaging and free of any debris. Place the filter in the housing and make sure its sitting level. Lubricate the o-ring profusely before trying to put the top back on. Take the time to make sure the o-ring is seated correctly and is not pinched in between the top and bottom of the filter canister. If the oring isn’t in correctly filter housing will leak. After the o-ring is set and the top is on; put the locking ring back on by turning it clockwise until the locks click and make sure it’s not cross threaded. Turn the pool back to the “on” position and wait for the system to prime up. Examine the filter and make sure no water is leaking, also take note of the pressure. This allows for a baseline pressure to be obtained.
A good indicator to clean the filter is when the pressure is 10-15 psi above the baseline pressure. Filters should be rinsed out monthly if the pressure doesn’t exceed 10 psi. Its good practice to replace filters annually. Clean filters keep the pressure low and the pool works best with low pressure. Low pressure leads to better utilization of chemicals and the pool will stay cleaner; longer. If you clean your filter and the pressure stays the same it is time for a new one.