My filter is leaking (dripping) through the outlet port of my sandfilter. I do not see any external cracks or damage. I have replaced the o-ring but it still leaks?

It sounds like there may be a problem with your Waterco T500 pool pump. Here are some troubleshooting steps you can try to determine the cause of the leak:

1. Check the pump seal: The pump seal is located between the motor and the pump housing and can sometimes wear out or become damaged, causing a leak. To check the pump seal, turn off the pump and unplug it from the electrical outlet. Remove the pump cover and inspect the seal for any visible damage or wear. If the seal is damaged, it will need to be replaced.
2. Check the o-rings: O-rings are used to seal the connections between the pump and other components, such as the filter, heater, and pipes. If an o-ring is damaged or worn out, it can cause a leak. To check the o-rings, turn off the pump and unplug it from the electrical outlet. Locate the o-rings and inspect them for any visible damage or wear. If an o-ring is damaged, it will need to be replaced.
3. Check the pipes and fittings: Loose or damaged pipes and fittings can also cause a leak. To check the pipes and fittings, turn off the pump and unplug it from the electrical outlet. Inspect the pipes and fittings for any visible damage or looseness. If a pipe or fitting is damaged or loose, it will need to be repaired or replaced.

If these troubleshooting steps do not resolve the issue, it is possible that there is a problem with the pump itself or another internal component. In this case, it may be necessary to have the pump repaired or serviced by a professional.

It's not unusual for a refrigerator to drip a little water on the floor after you replace the water filter-air trapped in the water dispenser system can make the water dispenser drip enough to overflow the drip tray below the dispenser. You can fix it by streaming a gallon or two of water through the dispenser to eliminate the trapped air.
If water drips on the floor from the back of the refrigerator, a leaking water inlet valve or cracked water system tubing could be the cause. A clogged or cracked defrost drain tube could also cause the leak. Defrost condensate water collects in the drain pan at the bottom of the refrigerator so a cracked or overflowing drain pan can also cause water to drip on the floor behind the refrigerator. Check the drain pan for cracks and clean out any foreign objects that may be inside the drain pan.
Excessive frost caused by a leaking door seal can also cause the defrost drain pan to overflow. Check the door gaskets and replace them if damaged.

Try cleaning it well and lubricate with the appropriate grease after you replace the o-ring again.

If you can put some food coloring in it so you can see the leak better and you find a crack in internal or external on both fitting; may be find the parts are warn down some and may need some plumming tape put on them or replaced.

filter head may be damaged check its flat where o-ring seals against and check for any cracks in filter head

Important: There is no service interval for in-line fuel filter replacement. Only replace the in-line fuel filter if it is restricted. 1. Relieve the fuel system pressure. Refer to the 2. Raise the vehicle. 3. Remove the fuel feed quick-connect fitting (4) at the inlet of the in-line fuel filter (3). 4. Remove the threaded fitting at the outlet of the in-line fuel filter (3). 5. Drain any remaining fuel into an approved gasoline container. 6. Inspect the lines for cuts, swelling, cracks, and distortion. Replace the lines as required. 7. Inspect the O-ring on fuel filter outlet pipe for cracks or damage. Replace the O-ring as required. 8. Inspect the fuel vent pipe (2). 9. Inspect the fuel return pipe quick connect fitting (1).

if you have replaced the O ring already it either got pinched when tightening, or the housing itself is warped or has a hairline crack, check the o ring again, and inspect the actual housing

This is happening to my fridge right now - what was the problem?

THIS IS A DEFINITE FLAW IN THE FILTER CHANGING THE SETTING WHILE RUNNING WILL DAMAGE THE SPROCKET SETTING UNDER THE HANDLE NOT CRACK A SEAM THE ONLY OTHER REASON WOULD BE IF FILTER HAS FROZEN