How often do you change out RO filters?

[kentrob11]

Do you recommend the adjustable flow restrictor? I've got a Kent Maxima HI-S that was originally a 35 GPD and has since been replaced multiple times with a 75 GPD membrane. It still has the tiny capillary flow restrictor on it. I'm probably not getting what I should out of that unit, huh? Also, is the best way to measure 1:4 ratio to start filling buckets up?

 

[Buckeye Hydro]

<a href=showthread.php?s=&postid=8769728#post8769728 target=_blank>Originally posted</a> by DrBDC
Cool! I need to get online and order from you guys. I bought my 75 gpd membrane, pressure gauge, refillable di unit and resin from you and it was the best prices I found!

I just noticed you carried the Dowflake and magflake too!

One more Q, will 2 storage tanks work? I was thinking of adding the 14 gallon one onto my system which already has a 3 or 4 gallon tank. Since they are pressurized which then makes the unit shut off, I would think it would work but thought I'd ask anyway.

Yes - two storage tanks would work for storage of RO water - but we discourage runnng that water back through standard 10" DI resin cartridges.

Russ

 

[kentrob11]

One more thing....Would a regular needle valve work for an adjustible flow restrictor? I've got one of these SMC needlevalves jus sitting in a drawer and wondering if I could use it....

http://www.usplastic.com/catalog/product.asp?catalog%5Fname=USPlastic&category%5Fname=15615&product%5Fid=15616

 

[Buckeye Hydro]

<a href=showthread.php?s=&postid=8769772#post8769772 target=_blank>Originally posted</a> by kentrob11
Do you recommend the adjustable flow restrictor? I've got a Kent Maxima HI-S that was originally a 35 GPD and has since been replaced multiple times with a 75 GPD membrane. It still has the tiny capillary flow restrictor on it. I'm probably not getting what I should out of that unit, huh? Also, is the best way to measure 1:4 ratio to start filling buckets up?

The adjustable flow restrictor is a nice feature but its not for everyone - more of an advanced user option. We used to include them on all our systems but regardless of the instructions included with the systems, some people insisted on running the systems with very high recovery (very low waste to permeate ratio) and they ruined their membranes. The adj flow restrictor took the blame, when in reality using the flow restrictor contrary to directions was the problem. Oh well...

If you are using a flow restrictor sized for a 35 gpd membrane with a 75 gpd membrane you may be damaging your membrane. This time of year, if you have cold tap water, you may actually be somewhere near a 4:1.

Yes - if your watch has a second hand and you have a gallon bucket, that would work fine.

Russ

 

[kentrob11]

So as log as I stay at 4 units of waste water to one unit of RO/DI , I'm where I should be? I wouldn't mind being able to adjust it during the winter to continue to get 4:1....

 

[DrBDC]

<a href=showthread.php?s=&postid=8769827#post8769827 target=_blank>Originally posted</a> by BuckeyeFS
Yes - two storage tanks would work for storage of RO water - but we discourage runnng that water back through standard 10" DI resin cartridges.

Russ

So storage tanks should only supply the r/o for drinking water and not through the di? If so I need to do some line reconfiguration. (I originally started my setup with one of those Watergeneral 6100 units ) I do notice that the tds is increased slightly for about a minute coming out of the storage tank vs. when it's trickling from the r/o membrane. The di makes it 0 but it would be using the di faster.

 

[Buckeye Hydro]

<a href=showthread.php?s=&postid=8769841#post8769841 target=_blank>Originally posted</a> by kentrob11
One more thing....Would a regular needle valve work for an adjustible flow restrictor? I've got one of these SMC needlevalves jus sitting in a drawer and wondering if I could use it....

http://www.usplastic.com/catalog/product.asp?catalog%5Fname=USPlastic&category%5Fname=15615&product%5Fid=15616

I couldn't get that link to work - but in theory, sure. The adjustable flow restrictor we sell is a needle valve.

 

[Buckeye Hydro]

<a href=showthread.php?s=&postid=8769881#post8769881 target=_blank>Originally posted</a> by kentrob11
So as log as I stay at 4 units of waste water to one unit of RO/DI , I'm where I should be? I wouldn't mind being able to adjust it during the winter to continue to get 4:1....

Correctamundo.

 

[Buckeye Hydro]

I do notice that the tds is increased slightly for about a minute coming out of the storage tank vs. when it's trickling from the r/o membrane. The di makes it 0 but it would be using the di faster. [/B]

IF you are getting 0 tds from the resin, then you are ok.

The problem is that if you quickly supply a realtively large volume of water to the resin, residence time will be shortened and you may not get adequate treatment from the resin.

You may find that as your resin approaches exhaustion you can get adequate treatment of low flows but inadequate treament of high flows.

One way to assure adequate residence time is to limit flow through the resin to the relatively slow flow of permeate put out by the membrane.

Russ

 

[kentrob11]

Awesome....thanks a lot for the info!