Ikaners, Yg punya kolam/aqua. Berapa sering anda mengganti media filter? Contoh-nya utk media dasar filter spt kapas dacron, zeolit, arang? Mungkin ada media laen boleh ditambahkan. Trus patokan buat "harus" ganti-nya apa? Apakah krn umur? Rusak? Dll Just curious. Thanks
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