It sounds like you may have phosphates in the water, do you have lots of leaves or the aftermath of seeds from the trees blowing in your area, I had poplar tree seed casings white fluffy things and it gave me this problem. Solution is a product called phosfree. I always change my filter's sand once per season, unless there is a high concentration of leaves and other debris being vacuumed up daily. Then I will change it out mid-season as well. After changing the sand, I always backwash the filter for at least 5 minutes. That way the pulverized dust and other small particles in the sand get whisked away, instead of going into the pool. The sand under normal use should last 5 to 10 years if it's backwashed well enough. The foam could be caused by the algaecide used. The usual reason for replacing the sand is when sand is returning to the pools or it is no longer effective. You should check with your local pool chemical supplier. Most pool sales and service companies supply free water testing when you are a customer.
This filter is a permanent filter and should only be replaced when replacing the fuel pump.
Per most manufacturers' instructions, you should replace your refrigerator's water filter at least once every six months. If your water tastes "off," you should consider replacing the filter even if it hasn't been six months.
Typically age/wear. If you replace one, you should consider replacing all of them as they are weakened by the bad one.
If the resistor is alright why replace it.
It is highly recommended.
It should be inspected once a year because critters are known to nest in there. Replacing the filter every 35K is a good practice but it really depends on how dusty the driving conditions are.
You can tune up your Nissan by replacing the spark plugs and spark plug wires. You should also replace the air filter and the oil.
Should be done within 3 hours if all goes well. Recommend also replacing fuel filter.
Replace every 30,000 miles.
How to replace a water filter on the fridge depends on what model it is. The filter and fridge manual should have directions listed. Usually the front of the bottom of the fridge has to be removed to replace it.
In any automatic transmission the fluid should be changed at the interval specified by the manufacturer. You should have the transmission oil filter replaced also at this time. Many shops will just suck out the old fluid and replace it with new without replacing the oil filter.