Well water degassing

[kpreslicka]

Hello all, I've been in the hobby about a year and I had an issue before where I was burning through a single di resin(anion). I have a 150 gpd seven stage brs rodi system with a smart buddie booster pump. I started degassing my water after the pre-filters and using a cheap Amazon ato pump to pump the filtered water up the smart buddie. I usually off gas the water for about 4-7 days before I make any. I am still having a problem of burning through di resin after the water has been de-gassed. I tested the pH of my water out of the faucet and it's about 7.7. TDS usually only shows around 45-60 in line 1. Is there anything else I might be missing or doing incorrectly? I'm changing all of my filters roughly once a month including resin and membranes.

 

[edd59]

degassing is to remove co2. ph of 7.7 i dont think you have co2. mine was 6.5 out of faucet, let it sit over night and it rose over 7. i think you have other problems with your water. im not that knolegeable so hopefully some one else can help. with 6.5 i probably got about 200 gal out of anion canister.

 

[kpreslicka]

Yeah I think I got around 150 or so out of that anion

 

[Fish Fan]

What's your pressure going into the RO membrane? If I'm reading your post above correctly, you are running your tap water through the first three pre filter stages, then allowing it to "off gas" (something I'm not sure is necessary), then you're using an ATO pump to pump the off gassed water to the booster pump, and then into the membrane(s)? If so, are you sure that this setup is indeed delivering high pressure to the membrane?

Are you using a cation resin in addition to your anion resin?

What is the TDS going into the RO membrane(s) and what is the final TDS after the DI resin(s)?

@Randy Holmes-Farley
@Buckeye Hydro

 

[kpreslicka]

What's your pressure going into the RO membrane? If I'm reading your post above correctly, you are running your tap water through the first three pre filter stages, then allowing it to "off gas" (something I'm not sure is necessary), then you're using an ATO pump to pump the off gassed water to the booster pump, and then into the membrane(s)? If so, are you sure that this setup is indeed delivering high pressure to the membrane?

Are you using a cation resin in addition to your anion resin?

What is the TDS going into the RO membrane(s) and what is the final TDS after the DI resin(s)?

@Randy Holmes-Farley
@Buckeye Hydro

So you are kind of correct. The ATO pump pumps up to my smart buddie booster pump and the smart buddie pumps into the membranes and di resin. I'm not sure if the TDS going into the membrane as my TDS meters are all on the resins. The final TDS is 0. I know at line 2 it's 5. I'm using anion, cation and a mixed bed. I can hook everything up normally and get you the TDS prior to the membrane if needed. I am not sure of the pressure exactly. When I change all filters and membranes the unit will make close to 30 gallons of water out of a 35g degassing chamber, so I'm assuming the pressure is adequate. It's just over time one of my resins depletes quickly. Like if I don't degas, it's every two weeks I'm changing filters (60-80g). Degassing gets me around a month(120-150g)

 

[Fish Fan]

So you are kind of correct. The ATO pump pumps up to my smart buddie booster pump and the smart buddie pumps into the membranes and di resin. I'm not sure if the TDS going into the membrane as my TDS meters are all on the resins. The final TDS is 0. I know at line 2 it's 5. I'm using anion, cation and a mixed bed. I can hook everything up normally and get you the TDS prior to the membrane if needed. I am not sure of the pressure exactly. When I change all filters and membranes the unit will make close to 30 gallons of water out of a 35g degassing chamber, so I'm assuming the pressure is adequate. It's just over time one of my resins depletes quickly. Like if I don't degas, it's every two weeks I'm changing filters (60-80g). Degassing gets me around a month(120-150g)

Don't rearrange your system for me, I'm not an expert with RO systems, I was just giving some ideas. I'm sure others will have better advise for you, especially the two I tagged above if they see this and have a moment to reply.

 

[kpreslicka]

Don't rearrange your system for me, I'm not an expert with RO systems, I was just giving some ideas. I'm sure others will have better advise for you, especially the two I tagged above if they see this and have a moment to reply.

Alright. I appreciate it. It's currently all unhooked cause I changed my filters and resins.

 

[twentyleagues]

@Buckeye Hydro ?

 

[kpreslicka]

Okay so just some info for everyone, I hooked everything up after changing all filters, resins, and membranes, and I'm getting around 210tds into the cation resin after the membranes. For more info I have the dual membranes

 

[twentyleagues]

I tagged Buckeye hydro they are a water filtration ro/di supplier.
I have kind of the same issues and thought it might be co2 but my ph is very high coming out of the faucet and 7.8 out of the membrane unit with very low tds. I tried testing with some water from before the resin and aerating it outside with an air pump no change in ph. I burn through anion also. As far as I know your degassing needs to be more "active" how you accomplish that idk. Probably air pump with outside air as the co2 will regulate with ambient air co2 so if your inside air is high in co2 letting the water sit will not help or not much anyway. If your inside air is low in co2 just water movement may be enough. Silicates from what I have read will cause anion depletion also.

 

[twentyleagues]

Okay so just some info for everyone, I hooked everything up after changing all filters, resins, and membranes, and I'm getting around 210tds into the cation resin after the membranes. For more info I have the dual membranes

Woah thats high.

 

[kpreslicka]

I tagged Buckeye hydro they are a water filtration ro/di supplier.
I have kind of the same issues and thought it might be co2 but my ph is very high coming out of the faucet and 7.8 out of the membrane unit with very low tds. I tried testing with some water from before the resin and aerating it outside with an air pump no change in ph. I burn through anion also. As far as I know your degassing needs to be more "active" how you accomplish that idk. Probably air pump with outside air as the co2 will regulate with ambient air co2 so if your inside air is high in co2 letting the water sit will not help or not much anyway. If your inside air is low in co2 just water movement may be enough. Silicates from what I have read will cause anion depletion also.

What I was doing is I had like 5 different airstones in the bottom of a brute can and just aerated it all the time for a couple days. The ambient air makes since since it's cold up here in Nebraska and I can't open the windows to allow fresh air in.

 

[twentyleagues]

What I was doing is I had like 5 different airstones in the bottom of a brute can and just aerated it all the time for a couple days. The ambient air makes since since it's cold up here in Nebraska and I can't open the windows to allow fresh air in.

Yeah I get that I'm in mid Michigan. Cold here too.

 

[twentyleagues]

Okay so just some info for everyone, I hooked everything up after changing all filters, resins, and membranes, and I'm getting around 210tds into the cation resin after the membranes. For more info I have the dual membranes

Lets get back to this 210 out of the membrane thing. That is very high. Do you know your source water tds?

 

[kpreslicka]

Lets get back to this 210 out of the membrane thing. That is very high. Do you know your source water tds?

I do not as I have never tested. I'm on a well so I assumed it was going to have a fair amount of tds

 

[Buckeye Hydro]

Okay so just some info for everyone, I hooked everything up after changing all filters, resins, and membranes, and I'm getting around 210tds into the cation resin after the membranes. For more info I have the dual membranes

We may have multiple issues going on here, but this looks like the most obvious place to start.

210 ppm TDS AFTER the RO membranes will blow through DI resin in no time.

What is the water pressure reaching your membranes?

What is the TDS of your feedwater?

Do you have a water softener?

 

[kpreslicka]

No water softener, unsure of the TDS before the membrane, and water pressure before my booster pump is 50psi after the pre-filters. I don't have a gauge to read the psi after but the booster pump is supposed to bump it up to 70-80 I believe

 

[Buckeye Hydro]

OK - it sounds like you are in need of some instrumentation if you want to troubleshoot the system.

Our TDS meters are here: https://www.buckeyehydro.com/meters-and-controllers/

Also get a Premium Pressure Gauge Kit here: https://www.buckeyehydro.com/pressure-gauges-1/

We currently have a 20% off sale going.

 

[kpreslicka]

Okay so just fyi, I found my problem i think. I had some air in the system and a clogged line. I now have 0 tds after the membranes. My next question is I have the brs 7 stage pro with the water saver kit (basically makes it 150 instead of 75). If CO2 isn't the problem, could it be because I oversized my rodi? In the fact that I'm burning through resin?

 

[Malum Argenteum]

The fact that you were burning through resin is due entirely to the fact that you were running 210 tds water into the resin. Now that that's fixed, the problem should be solved.