New filters RO/DI

Opus

2500 Club Member
View Badges
Joined
Aug 29, 2011
Messages
4,407
Reaction score
2,962
Location
North Texas
Rating - 0%
0   0   0
Update I replaced all of my filters except the RO membranes they are about 2 years old. I changed how my Inline filter reads, so now I checked my source water IN and between the RO membrane and the DI filters.
So now 360 source water and 10 PPM out of the RO membranes, does this sound about right? I checked my DI with a handheld and it reads 0 PPM.
That is a good number. You are sitting at 97.5% so not bad. It is well within the manufacturers spec of 95% rejection rate. So now it depends on if you are OK with that number. I have the 99% rejection membrane and my tap is over 400 and my tds after the membrane is 4. This number effects how long your DI will last. My 4 will get me around 1100 gallons of 0 tds water from a regular sized DI filter. Your 10 tds will get you around 440 gallons of 0 tds water.
 

flyfisher2

Valuable Member
View Badges
Joined
Jan 30, 2012
Messages
1,764
Reaction score
2,829
Location
Central Florida
Rating - 0%
0   0   0
That sounds good. And hopefully it'll stay that way. Just monitor what's coming out of your membrane from time to time. I have an ongoing issue with burning through membranes but I think we've narrowed it down to heat and possibly high chlorine or a faulty Membrane housing. I have a thread going as well. Good luck with yours. Eating Up RO Membranes
 
OP
OP
Blue Spot Octopus

Blue Spot Octopus

2500 Club Member
View Badges
Joined
Dec 30, 2016
Messages
3,315
Reaction score
1,395
Rating - 0%
0   0   0
Thanks again, I have purchased two more expensive RO membranes from MD while they were on sale, so I will change them but I will see how much I can get out of these.
 
OP
OP
Blue Spot Octopus

Blue Spot Octopus

2500 Club Member
View Badges
Joined
Dec 30, 2016
Messages
3,315
Reaction score
1,395
Rating - 0%
0   0   0
So I checked my system and now I have 500 tds at the source and 12 coming out of my DI, everything is new except https://spectrapure.com/collections...us-99-rejection-ro-membrane-90gpd-mem-sp-0090, so I bought two of these so does it mean that I replace these now?

My hand held HMDigitial TDS-3 that I purchased from a sponsor here that does water machines so I am comfortable that it is not a counterfeit, it is reading 1 - 2 TDS.

This is one the that states that it is 12 after the DI, https://www.bulkreefsupply.com/deluxe-dual-inline-tds-meter-dm-2-hm-digital.html.
So which one to trust?
 
Last edited:

flyfisher2

Valuable Member
View Badges
Joined
Jan 30, 2012
Messages
1,764
Reaction score
2,829
Location
Central Florida
Rating - 0%
0   0   0
There are formulas to determine the rejection rate you can expect from your membrane and the DI should be bringing you down to zero or very close to zero regardless of what makes it through the membrane. Just remember that if that number is relatively high you'd be burning through DI quickly. If I were you I'd be checking what your TDS is reading after the membrane (before your DI).
 
OP
OP
Blue Spot Octopus

Blue Spot Octopus

2500 Club Member
View Badges
Joined
Dec 30, 2016
Messages
3,315
Reaction score
1,395
Rating - 0%
0   0   0
I purchased another tester for my system so now one checks the water coming into the system and then before the Di and and after the DI so my reads are 473,10 and 0.
 

banger32

Active Member
View Badges
Joined
Aug 23, 2019
Messages
375
Reaction score
292
Location
Bradenton
Rating - 0%
0   0   0
You said your pressure gauge is broke is it broke or just clogged? I thought mine was broke also but really it was just clogged
 
OP
OP
Blue Spot Octopus

Blue Spot Octopus

2500 Club Member
View Badges
Joined
Dec 30, 2016
Messages
3,315
Reaction score
1,395
Rating - 0%
0   0   0
I tried cleaning it and it did not make a difference, what did you do to clean yours?
 

Mastering the art of locking and unlocking water pathways: What type of valves do you have on your aquarium plumbing?

  • Ball valves.

    Votes: 68 52.3%
  • Gate valves.

    Votes: 67 51.5%
  • Check valves.

    Votes: 33 25.4%
  • None.

    Votes: 29 22.3%
  • Other.

    Votes: 9 6.9%
Back
Top