Every 5 - 7 years you will have to replace the sand/glass in your filter. The media actually wears out. The sharp edges of the sand/glass particles become worn and rounded and don't capture the contaminates as well. Also the sand/glass will start to ball up or the water will create channels through it. An indication that you require a media change is that you will notice that your pool water is not as clean or the interval between required backwashes is shorter.


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