3 stages of carbon filtration sounds funny to me.
My Culligan RO unit has a 5 micron sediment/carbon stage followed by
an RO membrane.
Since it's a CTA membrane I'm only getting about a 95% rejection of
"bad stuff"

11 ppm / 210 ppm = 95% rejection

Sounds ok for RO to me but with the DI stage you should be doing
better.

I'd take a look at the output of the various stages to see what each
is doing.

DI alone should get that water very, very clean if it's new.


Erik



On Thu, 05 Aug 2004 18:09:06 GMT, "robin.gordon1"
wrote:

the stages are thus;

100 gallon per day membrane
5 micron sediment pre-filter
1 solid carbon block filter
1 GAC coconut carbon filter
1 inline carbon filter
1 inline DI filter
pressure= ?

tap = 211ppm
RO = 011ppm

i thought that i could put up with a slow production but not poor water
quality, especially with the money spent. surely 11ppm is a lot better for
my reef than 210ppm. i did have a tapwater purifier but i'm not sure of
it's quality. i'd be a bit peeved if it's better.

Robin