This interval may be significantly shorter depending on water usage, water quality, and water pressure. [Compatible Models] Al-Riki Rin Water Purifiers: TK-AS30, TK-AS31, TK7208, TK7408, TK8032, TK8232, TK7205, TK7206, TK7405, TK7406, TK7426, TK8030, PJ-A201, PJ-A202, PJ-A203, PJ-A301, PJ-A37, PJ-A37A, PJ-A38, PJ-A402, PJ-A403.
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