Pool and Spa
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Did you change the pump 3 seasons ago or placement of filter system? Also, what does the pool water look like now..cloudy? When you purchased the new cartridge was it entire filter or just the elements (inside pieces). I also need the information on pump size/model to determine if high head or medium head pump and also the filter size or model.
It sounds like either you are not adding enough DE to the filter, it is time to chemically clean the DE Grids or the flow from the pump is more than the filter really wants.
You need to know the exact model of the filter or sq. footage and how much and how are you measuring the DE powder. If you do not have enough DE in the filter you will have short filter cycles. The powder is what does the filtering, not the grids. The grids just retain the powder.
Periodically you need to clean the grids of the filter. The grids can collect grease and oils and that would need to be chemically cleaned.
DE filters only need 2 gpm per sq. ft. of filter area. So your pool only needs a maximum of 96 gpm or 48 gpm depending on the correct filter size. When the pool pump pushes more water out than the filter grid wants the dirt stays on the grid and doesn't fall to the bottom causing the pressure to build quickly. I'm not sure I understand about the hoses. If the ph is high or hardness is high that could also cause short filter runs. One way to check if the pool pump pressure is too much is to inspect the grids. If they are baggy that means too much pressure has been placed on them. I do not have the information on the pump so I do not know if you have a high head or medium head pump as that could mean a difference but you said you have not changed them.
90% of short filter runs are from the DE amount used. I hope this is what is wrong as it is the easiest to fix. There is a product called PUR FIBER that you use less of than DE and seems to be easier for customers to use. If you can confirm which filter you have, I can confirm how much and how to measure the DE or Fiber.