R/O units

[StirCrazy]

I get about 200 gpd from my unit this time of year, in the summer about 280 gpd.

One thing to note that a 100 gpd unit might realy be a 65 gpd at 60 PSI, most membrains ate dual rated ie. 65gpd@60 psi/100gpd@90 psi. My membrains are 90GPD@60PSI/160GPD@90PSI.

so if you are running them at 55 PSI you are going to be even lower than the 65 GPD and then cold water is a huge difference as they are usaly rated at warmer water also.

Steve

[Beverly]

b_james,

Could you please do me a favour and test ammonia levels of the water that comes directly out of your RO/DI unit for me? I'm getting .5 ppm ammonia out of my unit. Here's my thread on this issue....

http://www.canreef.com/vbulletin/sho...136#post186136

TIA

[crusty1]

As you raise the water temperature the membrane opens up and allows more salt passage, leaving the DI resin to do more work. I just found a data sheet that recommends Filmtec FT30 membranes to run at a max of 45 deg C. I think that is a pretty standard max temp on all TFC membranes.

[Dad]

the test results are; the water going into the r/o unit is 46f and the TDS is 220 and the water coming out is 65f and TDS of 004. Running the coil of line into my sump warms the water 20 degree and will check the gals tomorrow moring.