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Post by mrceniceros on Nov 11, 2022 13:51:16 GMT
Has anyone had their carbon tanks re-bedded?
I'm trying to look up the process on what the techs do in the re-bedding process and find a few different things online. Can someone explain it to me?
Thank you.
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Post by stuff on Nov 16, 2022 7:10:19 GMT
The process is remove the old carbon and put new carbon in. As the carbon absorbs the chlorine and chloramines, that bit of carbon becomes unusable. After extended use you have no carbon molecules that will absorb. All backwashing does is make sure there is no channels for water to flow directly out of the tank. Thus one needs to remove all the used up carbon and put in fresh
Sometimes it involves removing gravel and replacing orings, sometimes not. It is something that needs to be trained as just reading how can get the reader in a whole lotta hurt.(psi wise and messing things up wise)
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Post by Chuck Weddle on Nov 16, 2022 9:26:52 GMT
After we extract the old carbon, we put a gallon of bleach in the tank then fill it with water and let it dwell for an hour. No idea what strength bleach solution this ends up being. After the dwell we siphon the bleach/water out then refill with water and siphon out again. This usually has the bleach at undetectable levels but any residual would be removed by the new carbon. This is what we use to extract the carbon... Mineral Extractor |
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Post by briancanufixthis on Feb 4, 2023 14:43:38 GMT
We are noticing that after 6+ years the carbon starts to break down and the water is discolored upon start up.
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Post by Chuck Weddle on Feb 4, 2023 18:16:29 GMT
We are noticing that after 6+ years the carbon starts to break down and the water is discolored upon start up. I'm told that the frequency of backwash has a big influence on this. |
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Post by dave74 on Feb 5, 2023 2:46:26 GMT
We are noticing that after 6+ years the carbon starts to break down and the water is discolored upon start up. I'm told that the frequency of backwash has a big influence on this. Don't you have a policy on replacing the carbon after a certain number of years? Six years seems way too long. |
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Post by Chuck Weddle on Feb 5, 2023 12:42:48 GMT
I'm told that the frequency of backwash has a big influence on this. Don't you have a policy on replacing the carbon after a certain number of years? Six years seems way too long. Our policy is 10 years or if breakthrough occurs. The qualifiers for this policy: 1. We run EBCT's of 13+ minutes. 2. All except one clinic are near the ends of the municipal distribution and chlorine levels (no chloramine) are very low. 3. When we set the policy, we had a clinic that had 15 year old carbon that we rebed only because of fines starting to show up in the RO pre filter. 4. The remaining clinic has a Lignite bed as an organic scavenger that will last about 3 years. We do it and the GAC every other year. 5. We have one hospital that we also do every other year because they do their own chlorine injection. |
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Post by Stephen Mitchell on Aug 22, 2023 14:45:22 GMT
There are two best ways to remove carbon.
1. Media Extractor-Our team got a media extractor and put a long hose to reach the dumbster. Go slow with it cause it can backup on you.
2. The best way is to buy a large commercial shop vac and get everything out including gravel. Make sure you check the riser and basket. Replace if any of it looks bad or damage. Rebuild all the heads as well. get two or three barrels with the shop vac. Oh and a couple of shovels.
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pacnw
Full Member
Posts: 189
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Post by pacnw on Sept 8, 2023 15:00:40 GMT
if you haven't tried this media extractor you are missing out! It's very fast at removing the carbon... We've been using this system for at least the last 4 years and nothing even comes close to the speed of this extractor.... Well worth the price!
SWT 1 1/2" Media Tank Extractor Kit, w/Service
From SPECIALTY WATER TECHNOLOGIES INC
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pacnw
Full Member
Posts: 189
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Post by pacnw on Sept 8, 2023 15:13:57 GMT
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Post by h2otech on Oct 30, 2023 10:46:56 GMT
Since this thread is about Carbon Rebed, how long do you all go in between rebedding? We currently have the schedule to every 18 months but reading a few of these comments has me second guessing that. When we built we had it set to every 3 years however, had a breach at 18 months. We have never challenged that so, looking back at it now, I'm wondering if we could go back to doing it every 3 years or maybe even longer. We are at the end of the water distribution line from our city and so our chlorine levels in the city water are minimal.
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Post by Chuck Weddle on Oct 30, 2023 11:23:23 GMT
Since this thread is about Carbon Rebed, how long do you all go in between rebedding? We currently have the schedule to every 18 months but reading a few of these comments has me second guessing that. When we built we had it set to every 3 years however, had a breach at 18 months. We have never challenged that so, looking back at it now, I'm wondering if we could go back to doing it every 3 years or maybe even longer. We are at the end of the water distribution line from our city and so our chlorine levels in the city water are minimal. Providing your carbons are sized correctly I agree, you should be able to go longer than 18 months. In all of our years on Frederick St. we only rebed once for break-through. The other time is we thought they may have been causing a bacterial problem. That said, the city does have a habit of shocking the system which can prematurely cause failure. Do you keep carbon on-hand? |
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Post by alabamawaterguy on Nov 5, 2023 19:04:53 GMT
These Venturi extractors are a godsend after years of using a “blow through” extractor. I learned the hard way with those early on not to get too greedy and go too deep into the bed. One carbon explosion later and 4 additional hours of cleanup…. |
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Post by jadeddialysisbiomed on Jan 31, 2024 11:26:20 GMT
We've switched to just having the vendor exchange with wetted beds every two years. For the cost/benefit analysis it made the most sense, and I personally am still scarred from doing it myself  . Four nights a week backwash on primary, two on secondary and never see breakthrough on either (but we have excellent incoming water quality, oh wait no apparently we don't, can't keep up as it depends on who you ask  ) |
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. Four nights a week backwash on primary, two on secondary and never see breakthrough on either (but we have excellent incoming water quality, oh wait no apparently we don't, can't keep up as it depends on who you ask 
)