?? about ro di unit
- Thread starter pepino
- Start date
Are you asking whether or not you need to buy new filters with current TDS of 7 ppm?
If so, I would, at least the prefilter, carbon block, and DI; however, 7 ppm isn't terrible, you could survive fine for a while without new filters
If so, I would, at least the prefilter, carbon block, and DI; however, 7 ppm isn't terrible, you could survive fine for a while without new filters
I would ask the Air Water and Ice guys to make sure but I would check the TDS of tap water and the TDS of water coming out of the RO, before the DI. You should be getting at least 95% removal with just the RO and 99% or better with the DI. If your getting less I would by a new RO membrane
yep
Don't blame me if everything including your dog dies a painful death by just by looking at your tank J/K but... I think you'll be ok.
From what I've heard, 7 ppm is pretty good compared to the RO water various LFS around are selling!
That said, personally I try and shoot for 2 ppm or less.
From what I've heard, 7 ppm is pretty good compared to the RO water various LFS around are selling!
That said, personally I try and shoot for 2 ppm or less.
RO/DI
RO/DI
I am not the ultimate expert on this topic, but a similar thing just happened to me. I bought a used RO/Di unit and it worked great for a couple of months. Then the TDS started climbing. I changed my DI media with some that changes color when its used-up so I could monitor it in the future, and my TDS immediately went back down to zero. My advice would be to change the DI media before you consider changing the RO membrane - which is what I almost did.
Bruce
RO/DI
I am not the ultimate expert on this topic, but a similar thing just happened to me. I bought a used RO/Di unit and it worked great for a couple of months. Then the TDS started climbing. I changed my DI media with some that changes color when its used-up so I could monitor it in the future, and my TDS immediately went back down to zero. My advice would be to change the DI media before you consider changing the RO membrane - which is what I almost did.
Bruce
Changing the DI will work but if your RO membrane is fouled it will only work for the short term and you'll be going through DI cartridges or media like hot cakes.
The DI media picks up anything that the RO membrane misses. If your RO membrane is fouled than your DI will be working overtime and you'll be replacing your DI media way more often than you need to. That's why I recommended that you test your water coming directly out of your RO first. Since you purchased a used unit you need to find out the current efficiently of the old RO membrane
A good RO membrane can last you a long time (3 years or longer) if its used correctly and maintained. It all depends on how bad you water is, how much water you push thru it, and how often you flush it. I've had membranes last me close to 6 years. However, it only took one poorly seated prefilter to ruin one membrane in less than a month
The DI media picks up anything that the RO membrane misses. If your RO membrane is fouled than your DI will be working overtime and you'll be replacing your DI media way more often than you need to. That's why I recommended that you test your water coming directly out of your RO first. Since you purchased a used unit you need to find out the current efficiently of the old RO membrane
A good RO membrane can last you a long time (3 years or longer) if its used correctly and maintained. It all depends on how bad you water is, how much water you push thru it, and how often you flush it. I've had membranes last me close to 6 years. However, it only took one poorly seated prefilter to ruin one membrane in less than a month
pepino
Active member
ok i did check the water coming with out the membrane and it marked 023 and then i put it back on and checkit again and it marked 004
i havent used the system much i have been buying the water to do my water changes and the person that i bought it from when i bought it he told me that the filters were going to need replace soon so cant tell exactly how old the system is
i havent used the system much i have been buying the water to do my water changes and the person that i bought it from when i bought it he told me that the filters were going to need replace soon so cant tell exactly how old the system is
By my calculations your RO membrane is running at about 92% efficiency. I would try increasing your waste water ratio and see if that helps, if not, buy a new membrane.
You should have a valve to adjust your water pressure at the membrane. This will allow you to to adjust your waste
roduct ratio. You should be shooting for a minimum of 3:1 but your membrane will last longer if you go 4:1 or even 5:1.
You just need a couple equally sized cups to check it
roduct ratio. You should be shooting for a minimum of 3:1 but your membrane will last longer if you go 4:1 or even 5:1. You just need a couple equally sized cups to check it
StupidsReef
Premium Member
This is JMHO, but beings it's a used system I would buy all new filters and a membrane. And then because it's a used one I would, just to be safe that is, remove all the filters + membrane and place 2 table spoons of bleach into the first chamber and then run the unit for about 1 hour ( empty out your DI resin before do this too ) then place the new filters + membrane & new DI back in it.. Water can form bacteria fast if it's sat for any amount of time not used, or just poor water can do it too. I do this to my system once a year as was suggested to me from thefilterguys, But then again I go through 55g of fresh water every 9 days too, ( that's water changes & top offs on both my system & Rich1972's ) and our water quality is horrid.
Good luck with your new "toy" and 7 is not nasty but 0 would be best
Good luck with your new "toy" and 7 is not nasty but 0 would be best
Buckeye Hydro
.Registered Member
Used systems can be tricky.
First - try to find out the history of the system - how old are the prefilters? The membrane? The DI resin?
How long was the system unused before you bought it? If too long, the membrane may have dried out, or the system may have developed "bio-slime."
If that sort of information isn't available, and you want to be safe:
1. Strip all filters from the system and sanitize it (we can provide instructions if needed).
2. Install new filters.
Russ
First - try to find out the history of the system - how old are the prefilters? The membrane? The DI resin?
How long was the system unused before you bought it? If too long, the membrane may have dried out, or the system may have developed "bio-slime."
If that sort of information isn't available, and you want to be safe:
1. Strip all filters from the system and sanitize it (we can provide instructions if needed).
2. Install new filters.
Russ
I agree your best bet is just to buy all new filters and membrane but if your strapped for cash you can probably make the membrane you have work.
