tds readings

"Boomer" wrote in message
...
"That would be 850 uS and 80 uS respectively."

And roughly divide by 2 for TDS

850 = 425 TDS

80 = 40 TDS

You have some hard water but I have seen higher. EPA drinking std are not
to exceed 500
TDS (IIRC)

Thank Boomer.

Erik,
Ahh... that more about right. But as for the product from RO should not be
that high with 100GPD. IIRC from previous post, you have DI unit too. From
that DI output should be close to non-detectable. From your RO output, that
seem to be still high. 40TDS is similar to SF water without using any RO
unit.

You might want to check what the PSI before going into the unit. Do your RO
have a PSI meter? If so, what it indicating?

CapFusion,...

No DI yet. I'm looking into building one. PVC pipe is cheap )

Anyway, 40 ppm TDS may still be high but if I'm getting a 90 to 95 %
reduction in TDS after the RO should I be expecting better of a CTA
membrane?


Erik

On Fri, 13 Aug 2004 13:12:11 -0700, "CapFusion"
CapeFussion...@hotmail.., com wrote:


"Boomer" wrote in message
...
"That would be 850 uS and 80 uS respectively."

And roughly divide by 2 for TDS

850 = 425 TDS

80 = 40 TDS

You have some hard water but I have seen higher. EPA drinking std are not
to exceed 500
TDS (IIRC)

Thank Boomer.

Erik,
Ahh... that more about right. But as for the product from RO should not be
that high with 100GPD. IIRC from previous post, you have DI unit too. From
that DI output should be close to non-detectable. From your RO output, that
seem to be still high. 40TDS is similar to SF water without using any RO
unit.

You might want to check what the PSI before going into the unit. Do your RO
have a PSI meter? If so, what it indicating?

CapFusion,...

"erik" wrote in message
...
No DI yet. I'm looking into building one. PVC pipe is cheap )

Anyway, 40 ppm TDS may still be high but if I'm getting a 90 to 95 %
reduction in TDS after the RO should I be expecting better of a CTA
membrane?



When I see 40ppm reading from TDS and want to consider this to be a puriest
source water mix for a reef tank, I would hestitate a bit. But for human
consumption, than, I would say ok. 40ppm reading, will cause algae war /
battle to eternity and normally algae will have the advantage over you. I do
not know much regarding CTA type membrase in RO but as general RO concern,
it should bring down to something like 10ppm or so with TFC or similar
membrane.

With 40ppm, I would suggest using DI unit to further reduce this
filteration. Or change your membrane beside CTA and see if you have better
result without DI unit.

CapFusion,...