Reverse Osmosis Question...

gizmo · Joined: 16 Aug 2007 Posts: 37

Hi All,
This is a simple tech question regarding a Reverse Osmosis System....
Recently I've purchased such a system of 100GPD. At the beginning the output
was really 100GPD, but now it works with 85GPD even after I've replaced the
Filters. (One Pre and two carbon filters....)
I can add that the water quality is great and I use the system quite often.
Is this a normal decrease in such systems ?

Thanks,

A.B

Archived from group: rec>aquaria>tech

Mort · Joined: 16 Aug 2007 Posts: 61

"gizmo" wrote in message$vznnkh$1cd$1@lnews.actcom.co.il...
> Hi All,
> This is a simple tech question regarding a Reverse Osmosis System....
> Recently I've purchased such a system of 100GPD. At the beginning the
output
> was really 100GPD, but now it works with 85GPD even after I've replaced
the
> Filters. (One Pre and two carbon filters....)
> I can add that the water quality is great and I use the system quite
often.
> Is this a normal decrease in such systems ?
>
> Thanks,
>
> A.B
>
>
>
>

IME yes, the RO membrane will slow a litttle as it ages. Also, your supply
water pressure plays a major role in your GPD.

HTH

~Mort

Rbogath · Joined: 16 Aug 2007 Posts: 12

The water temp, pressure, pH and TDS of your feed water will determine the
amount of water produced by your RO unit.

Colder water produces less (most membranes are rated at 77F)

Lower pressure water produces less (Most membranes are rated at 50 or 60 PSI)

pH above 8.0 produces less (membranes are rated at 8.0)

TDS above 200 PPM produces less (membranes rated at 200..)

So, if your water is getting cooler, your output will drop. It's getting to be
that time of year...

Also, you might want to give your membrane a good flush.

HTH,
RandalB