DI resin spent too fast?
- Thread starter toddmau5
- Start date
Buckeye Hydro
.Registered Member
55 ppm CO2
Not sure if thats high or low? obviously for DI resin we would want to shoot for zero I am assuming
Buckeye Hydro
.Registered Member
That 55 ppm CO2 will eat the DI resin just like 55 ppm of TDS. So it is sky high.
0dkh and 6.9ph after the degasser. Could be wrong but the alk test changed instantly after the first drop
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Buckeye Hydro
.Registered Member
0 ppm CO2
TampaSnooker
Active member
I was just talking with the OP about this today. What is the formula for the conversion? I pull locally from a shallow well and treat CO2 with a separate anion bed. I would like to compute raw water and softened water separately because often I let the unit run overnight when the softener regenerates and have wondered if that affected performance significantly.
TampaSnooker
Active member
Russ, I make about 500 gal a week from my well, based on DI consumption. Currently I run sediment - carbon - booster pump - 2nd carbon - 2 parallel membranes - 20" mixed bed ' 10" anion for 150 gpd.
If I were to install an offgas barrel, would it make sense to do the offgas barrel first or sediment and carbon prefilter -> offgas barrel -> self priming booster pump -> RO - DI? Or would it be better to run through the membrane before offgas and then DI? My FW storage vessels are ceiling high, so gravity fed DI is not a good option.
Chlorine/chloramine are not a concern, but raw water is 6-8 ppm iron if I remember.
If I were to install an offgas barrel, would it make sense to do the offgas barrel first or sediment and carbon prefilter -> offgas barrel -> self priming booster pump -> RO - DI? Or would it be better to run through the membrane before offgas and then DI? My FW storage vessels are ceiling high, so gravity fed DI is not a good option.
Chlorine/chloramine are not a concern, but raw water is 6-8 ppm iron if I remember.
Buckeye Hydro
.Registered Member
Here's a calculator you might like: https://www.hamzasreef.com/Contents/Calculators/CO2LevelFresh.php
Russ
Russ
Buckeye Hydro
.Registered Member
Why not move your booster pump so it is after ALL your prefilter housings?
Why are you running two carbon blocks on non-chlorinated water? Is there an issue with organics you're struggling with?
Buckeye Hydro
.Registered Member
Well, that is sky high iron - so I'll assume you have a whole house treatment system in place that treats the feedwater before it hits the RO. If you don't, then you should aerate the feedwater prior to it reaching the RO. Aerating the water should oxidize the iron (ferrous ->ferric) and cause it to come out of solution.
If the iron is already removed, the the location of the aeration barrel is really up to you. If you put it before the pump you can use the booster pump to drive the RO and provide pressure to the DI. Plan on needing to clean the barrel - so don't squirrel it away behind/under something - you'll need good access.
Buckeye Hydro
.Registered Member
The "three biggies" with bad well water are iron, manganese, and H2S. They often occur together. Do you also have Mn and H2S?
Russ
Russ
TampaSnooker
Active member
Thank you for the link and thought out reply. We live adjacent to orange groves and had several citrus trees around the well's location, so the double carbon is purely precautionary. It is also laziness that I never changed the configuration after moving from city water with chloramine, although I did switch to a cheaper 10 um carbon block instead of the catalytic carbon.
Iron is quite high, but we have never had issues with sulphur. I've never tested for Manganese. We do have a good softener system and the company that maintains it for us shows us 0 iron in tests post filter.
Seems it may be a good idea to prefilter, then offgas CO2 and precipitate Iron before pumping through the membranes and DI. The booster pump is self priming and I can keep the settling barrel full with a simple float switch and let the booster draw from that barrel. I'll see if time permits me to get pH and KH readings from raw and treated water this afternoon to see what my actual CO2 levels are. I installed the anion cartridge a few years back after reading one of your posts about it and it worked, so I didn't bother to follow up.....
I do have another question - I've read that ammonia and silica are released from DI resin first when it is exhausted. Do you know what else is released first when resin is exhausted? Same question for carbon blocks. I have always suspected that something is released from carbon because of cyclical algaes that pop up every 4-5 runs. Each run is whatever I get from the DI until the TDS meter clicks up to 1. Prefilters are changed every 4 runs based on history of algae/diatom observations.
Iron is quite high, but we have never had issues with sulphur. I've never tested for Manganese. We do have a good softener system and the company that maintains it for us shows us 0 iron in tests post filter.
Seems it may be a good idea to prefilter, then offgas CO2 and precipitate Iron before pumping through the membranes and DI. The booster pump is self priming and I can keep the settling barrel full with a simple float switch and let the booster draw from that barrel. I'll see if time permits me to get pH and KH readings from raw and treated water this afternoon to see what my actual CO2 levels are. I installed the anion cartridge a few years back after reading one of your posts about it and it worked, so I didn't bother to follow up.....
I do have another question - I've read that ammonia and silica are released from DI resin first when it is exhausted. Do you know what else is released first when resin is exhausted? Same question for carbon blocks. I have always suspected that something is released from carbon because of cyclical algaes that pop up every 4-5 runs. Each run is whatever I get from the DI until the TDS meter clicks up to 1. Prefilters are changed every 4 runs based on history of algae/diatom observations.
Ted_C
Active member
This thread is funny to see popping up now - I also burned through my Mega MaxCap DI Cartridge (Spectrapure) in three months for the water station I have in the garage.
Same parameters too - whole house softener at least and 98% rejection on the membrane (or better). I thought it might be the cold weather or the fact I have it running in the garage or something.
The one inside the house seems to be running OK.
Same parameters too - whole house softener at least and 98% rejection on the membrane (or better). I thought it might be the cold weather or the fact I have it running in the garage or something.
The one inside the house seems to be running OK.
It's been an issue for me since at least June/July 17' so what happened to all our Florida water? Lol
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TampaSnooker
Active member
I know my production got slooooooow on the cold nights. I didn't pay much attention to the quantity per DI though.
lionfish300
New member
How do you degassing a RO/DI system?
Really good article was posted towards the top of the thread https://www.aquaticlife.com/blog/how-co2-can-impact-di-resin-consumption/
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TampaSnooker
Active member
Chris, you've got naaasty water. They make you pay for that? My sediment cartridges are white when I change them after 1500 gal of product water, 6000 gal +/- total water - and I'm on a shallow well. Must be something to be said for sand filtration...
