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Filter sand can typically last anywhere from five to ten years, depending on how often the sand is cleaned. Filter sand will lose its effectiveness to filter the water from years of granular erosion, as well as matting and impacting of the sand due to oils, dirt, calcium, and clay.
If any of the following statements apply to you, it may be time to change your sand.
I have to backwash more often due to the pressure rising faster.
Example: If you used to backwash every eight days, but now you're backwashing every five days because of your pressure reading, it's time to replace your sand.
Even though my pressure gauge is saying it's time to backwash, I see very little dirt flush out when I do backwash.
If you see very little dirt through your sight glass as you backwash, it's time to change your sand.
After backwashing and rinsing, dirt flows out from my inlets.
If you see this ugly sight, it's time to change your sand.
I've used biguinide products, and was told I need to afterwards change my sand.
You are right! If you've used biguinide products in your pool such as Baquacil, you need to change your sand.
Certainly, you can call a Memphis Pool Service Technician to replace the sand for you, or you can do it yourself. If you choose to tackle the task yourself, the following are the steps needed to change your sand.
Note: Installation manuals of different models offer a number of tips to help you change the sand in your filter. For instance, some recommend holding the standpipe to make sure it doesn't come loose while pouring the sand.