Quick take
Frizzlife lists ASR212-600G for PD600-TAM3 with a 24-month nominal lifespan and current listed price of $85.99.
Correct fit
ASR212-600G is listed for PD600-TAM3. Do not substitute the 800G version used by PD800-TAM4.
Replacement life
Frizzlife publishes a 24-month nominal replacement interval. Real membrane life depends on feed-water quality and operating conditions.
Current price
The manufacturer currently lists ASR212-600G at $85.99.
How to tell the membrane may be aging
Rising product-water TDS or falling rejection can indicate membrane wear, though feed-water changes and flushing should be ruled out first.