How long do you flush your new RO membrane?

[Fishingandreefing]

It’s about that time (1.5 years) I need to replace my RO membrane and based on Aquatic Life video, it’s recommended to flush 30g but there’s no written instructions and all I found on most info is that anywhere from few mins to 2 hours.

It would take about 7 hours for me to flush 30g even with the booster pump.

I have the Aquatic Life 100gpd 4 stage twist unit.

Thanks

 

[MMI]

I usually flush mine for an hour or about 5 gallons.
https://www.melevsreef.com/articles/how-change-ro-membrane"Let the unit run for about one hour (5 gallons worth) to wash out the food grade preservatives, but not through the DI resin. The system is now ready to be used again, and the new membrane should last one to five years. It should last several years, but some areas of the U.S. simply destroy membranes at one year unfortunately."

 

[Happy Clam]

Website states to flush the RO membrane for 30 min/Also you should find out if your city uses Chloramines in their water, it will ruin your filters faster and they make a special filter for this, (Aquatic life). Most people do not check their city water and filters go out a lot faster.

 

[EeyoreIsMySpiritAnimal]

It’s about that time (1.5 years) I need to replace my RO membrane and based on Aquatic Life video, it’s recommended to flush 30g but there’s no written instructions and all I found on most info is that anywhere from few mins to 2 hours.

It would take about 7 hours for me to flush 30g even with the booster pump.

I have the Aquatic Life 100gpd 4 stage twist unit.

Thanks

That's usually 30 gall9ns thru it, not 30 gallons of RO water produced.
That being said, I do it for 30-45 minutes to be on the safe side

 

[Fishingandreefing]

Got you but the video did say 30g RO but whatever you guys said makes sense. Regardless what brand, you all flush with the prefilter correct? (Carbon, sediment flush the new membrane without DI)

 

[twentyleagues]

If its a standard ro unit it should have a flush valve on it and it should not take a long time to flush it. You wont produce ro water with it while its in flush mode. I have an under sink for drinking water without a flush valve and that you do produce ro water and need to discard the first 6 gallons produced.

 

[Kmst80]

Website states to flush the RO membrane for 30 min/Also you should find out if your city uses Chloramines in their water, it will ruin your filters faster and they make a special filter for this, (Aquatic life). Most people do not check their city water and filters go out a lot faster.

I thought that's why you have a carbon filter pre ro to take care of chlorine and chloramine.

 

[Fishingandreefing]

That's usually 30 gall9ns thru it, not 30 gallons of RO water produced.
That being said, I do it for 30-45 minutes to be on the safe side

If I compare to my waste and ro line, it appears that it takes about 30g tap to make 10g of ro so 1:3 ration and I did measure it before because sometimes I collect the waste water to water the plants

 

[EeyoreIsMySpiritAnimal]

Got you but the video did say 30g RO but whatever you guys said makes sense. Regardless what brand, you all flush with the prefilter correct? (Carbon, sediment flush the new membrane without DI)

Install sediment and carbon(s), then run water 3- 5 minutes. Add membrane and run as discussed. Then put any DI online and discard the first 5 or so gallons.

 

[Fishingandreefing]

I ended up running through about 10g of rodi and took me about 1.5 hours. Tap was little 200 and came out at 5 after few mins. Then it dropped down to 4 on the second. Bucket. So I did the math that’s about 2% and I called it, added the DI flush it for like a min and now it’s 0 making 1.3g in just little over 13 mjns.

It took about 21 mins before

 

[smitten with ocean life]

yikes! i just changed my filters too and i only let it run a couple of minutes :grimacing-face:

 

[Fenral]

Oh boy -- I don't think i've ever changed an RO filter in 20 years...Just backflush and go on with life...

 

[Happy Clam]

I thought that's why you have a carbon filter pre ro to take care of chlorine and chloramine.

Chlorine yes chloramine no

That's usually 30 gall9ns thru it, not 30 gallons of RO water produced.
That being said, I do it for 30-45 minutes to be on the safe side

look at the instruction for your RO system it stated 30 min but when it is new and colder outside I have to admit mine will run better, there are by products in the filter that keep it good, but it never states it will or won’t harm fish , remember that filter could have been on a shelf for some time.

 

[Happy Clam]

I thought that's why you have a carbon filter pre ro to take care of chlorine and chloramine.

Also I found it under the RO buddy website

 

[Happy Clam]

That's usually 30 gall9ns thru it, not 30 gallons of RO water produced.
That being said, I do it for 30-45 minutes to be on the safe side

Yes 30 minutes

 

[bobnicaragua]

I probably flushed mine only 2 or 3 minutes!

 

[Fishingandreefing]

Chlorine yes chloramine no

look at the instruction for your RO system it stated 30 min but when it is new and colder outside I have to admit mine will run better, there are by products in the filter that keep it good, but it never states it will or won’t harm fish , remember that filter could have been on a shelf for some time.

For me it was a rep from their company recommended flush 30g RO water so I want to hear from other because it seems not right.

 

[Kmst80]

Chlorine yes chloramine no

look at the instruction for your RO system it stated 30 min but when it is new and colder outside I have to admit mine will run better, there are by products in the filter that keep it good, but it never states it will or won’t harm fish , remember that filter could have been on a shelf for some time.

https://www.filtersystemsaustralia....r-filter-pack-10-x-2-5-gt4-6lpd-gt4-6crc.html

 

[Randy Holmes-Farley Verified Community Expert]

It’s about that time (1.5 years) I need to replace my RO membrane and based on Aquatic Life video, it’s recommended to flush 30g but there’s no written instructions and all I found on most info is that anywhere from few mins to 2 hours.

It would take about 7 hours for me to flush 30g even with the booster pump.

I have the Aquatic Life 100gpd 4 stage twist unit.

Thanks

Just curious about the replacement reason. Was the flow through it getting too slow?

 

[Randy Holmes-Farley Verified Community Expert]

I thought that's why you have a carbon filter pre ro to take care of chlorine and chloramine.

It is. IMO, many people use expensive carbon filters for chloramine when normal carbon filters often work fine.

There may be some cases where chloramine is so high or flow so high that a normal carbon filter doesn’t do the job, but in mine a normal filter was adequate, as it was in many others when I was preparing my chloramine article.