I've used BRS DI media but it didn't last long or maybe because my membrane was shot and I was running low pressure. I remember it lasted about 3 months. Currently running a booster pump now at 85psi my tap is 287 TDS and before the DI is down to 3 TDS then 0 TDS after DI. I've been using spectrapure max cap filter kit and I've replaced my silicate buster 9 months ago. But replaced my sediment and carbon filter every 6 months.