Hello...I don't have a faucet that will allow the flushing mechanism to stick to it. Is there another way to flush it out?

You can try another faucet ( ie Bathroon or laundry room )  Manufacturer recommends an outside spigot when no other faucet will accommodate the flushing bulb.  As they know it will fit correctly and flush properly

How long does filter last

Around 6 months.

Does this include 2 filters for the pitcher?

Yes, it comes with the filters.

I haven't kept track of how many gallons of water I have used with my filter's how can you tell when it's time to change them?

If you have flushed them and the flow rate has not come back to a good flow or the water starts getting the bad taste back. Normally you change them every 4 to 6 months.

I have: 1-40500-2. PH Gen2 Pitcher replacement filters (2). What is the difference between the 40500 and the 40100...both Gen2?

Both of them will fit your pitcher! The 1-40100-2 Gen 2 pitcher filters remove the same contaminants they just DON'T raise the PH of your water.  Where as the 1-40500-2 Dual Alkaline replacement filters will raise the PH plus remove the contaminants ( same as the Regular Gen 2 filters )

I have the two filter model, and the filters filter exremely slow sometimes never. What is the problem

The filters need to be flushed properly ( meaning the flushing bulb needs to fit correctly onto your faucet for flushing )  If it doesn't fit well try using an outside spigot to flush them.  You will need to have good pressure for flushing them as well.  The media inside the filters need to be completely saturated before they will work correctly. Sometimes it takes a few times flushing and using to get them flowing correctly as well.   You may have to flush them periodically throughout the filter life as well.

Will these work in an Alexapure pitcher ?

Yes, they will work in the Alexapure.

What is the difference between replacement GEN2 REG 1-40100-2 and 1-40101-2?

The 1-40101-2 is for the newest pitcher model it comes with 2 filters. The 1-40100-W is for the old-style pitcher it has one large filter.

Will these fit the ph pitcher? I have the ph pitcher, but I am not looking to adjust the ph of my water.

Yes, they will fit the ph pitcher.

Do these filters fit on the smaller pitchers?

Yes, they will fit the smaller pitcher.

Is there 2 in the package?

Yes, there are 2 filters.

When are you supposed to change the filters?

They have a filtering capacity of 200 gallons. Around 3 to 4 months.

what is a sign that my filters need to be replaced?

The bad taste will come back or the water flow through the filters will slow way down. Sometimes flushing them will help the flow rate.

Are these filters for the 64 oz. seychelle pitcher?

Yes, they are.