The TFC [Thin Film Composite] is the last filter before the Di
in most setups and last on set ups without DI
It is the filter usually in the non clear housing sitting horizontal on top of unit...
It is the most expensive of filters and should last 2-3 years if you care for the filters before it.
expires the fastest of all media used..
I like the BRS color changing DI
media as just one look tells you where it is at..It starts blue and dies yellow....
will 'migrate' through the TFC when the unit is off..This is called osmosis as the water seeks equilibrium inside the unit without pressure...
is350 from source.When I open my ro
meter [built in BRS] it goes up to 200 sometimes [quickly] and then returns to 10-20 in under 30 seconds..I have installed a T after the TDS
sensor and discharge the first bit of water until it gets back to low TDS
I use a lot of RO
water without DI
for my fresh water breeding efforts..I use the DI
[have BRS dual DI
] for my marine tank.It is always zero or I change one of the DI