MaxCap 90 Meter Readings

[918ReefCpl]

Just installed a MaxCap 90 system on our house and had some questions about the following results:

Followed the instructions and we were getting the following readings following initial set up:

Yellow waste: 515ml/60sec
Blue - output: 220ml/60sec
Flowrestrictor: cut at 2-7/8" length
0.8 PCF = 48psi (line) /60
1.180 TCF = temp correction factor 87'F water temp
84.96 gpd = 3.54 gal per hr
97.8% rejection factor

TDS IN 505 (pre RO membrane)
TDS OUT 11 (post TDS membrane)
TDS IN 000 (pre silica buster)
TDS OUT 000 (Post silica buster)
********************************
After producing about 25 gal of Pure Water
99.1%-100% rejection factor (?)
TDS IN 343 (pre RO membrane)
TDS OUT 000-003 (Post TDS membrane)
TDS IN 000 (pre silica buster)
TDS OUT 003 (Post silica buster)

Something doesnt quite add up and all TDS meter's were factory installed no re-piping was done to any equipment...

thoughts?

[SpectraPure]

Your very warm water probably makes the FR chart a little off.
Shorten the FR another 1/2 inch to get to at least 3:1 with your very warm water. In the winter, the ratio will naturally be closer to 4:1.

Be sure all the probes are aligned the same way, preferably with the pins ACROSS the water flow and not in-line.

If you still see small differences in TDS, swap the probes and see if the differences track with the probes or stay the same. If it is determined that a probe is 003 off, just mentally subtract it to get a more accurate reading. You can get a more accurate in-line TDS meter for $175.

Also notice how the tap-water TDS changes with time. That affects the downstream readings.

Scott
SpectraPure, Inc.

[918ReefCpl]

Thanks Scott,
This system was just assembled at your shop on Friday Sept 7th. The inline TDS meters are the upgraded TDS-DL2 models and I have a Hanna COM-100 handheld that i got at the same time (that gave the temp reading). The probes were installed at the shop & have not been rotated/moved in their housings. I was just concerned in that I had zero (0) TDS out of the SB cart initially and now it says 3ppm out of the SB after such a small amount of water passing thru.

I just redid the rinse-up proceedure, reading are now:
TDS IN (pre-RO) 348
TDS OUT (post-RO) 000
TDS IN (pre-SB) 000
TDS OUT (post-SB) 000-001
Probes are aligned according to the HANNA DM-2 instructions & are ACROSS the water flow not inline with flow.
COM-100
temp reading of 89.0F
ppm 0.4

[918ReefCpl]

Just rechecked the meters after running for about 3hrs:
TDS IN (pre-RO) 444
TDS OUT (post-RO) 012
TDS IN (pre-SB) 000
TDS OUT (post-SB) 012
temp 85.6'F
Whats most concerning the the 12ppm out of the SB cartridge...at the most it has 75 gals thru it?

thoughts?

[SpectraPure]

Please swap the two probes on the right-hand meter. If the post-SB now reads zero, you know the probe is off. We'll go from there.

Scott
SpectraPure, Inc.

[918ReefCpl]

Hi Scott, did as you requested and here are the results

TDS IN (pre-RO) 440
TDS OUT (post-RO) 010
TDS IN (pre-SB) 007 [reversed probes-OUT probe]
TDS OUT (post-SB) 000 [reversed probes - IN probe]

Hanna shows 0.6ppm in the output water....
looks like we may have a Bad meter?
I can bring the meter and the DI/SB cart's to the shop if you would like and we can test them there?
thoughts???
thanks for the help... :)

[SpectraPure]

Sure, bring them by and we'll get to the bottom of the confusion.
Just not during the noon hour.

Scott
SpectraPure, Inc.