Elimination/Reduction of TTHMs
I am looking for a whole-house (POE) filter, and appropriate housing, that would reduce/eliminate TTHMs (Trihalomethanes) in my water in a 2 bathroom house. I understand TTHMs are a by-product of chlorination. My plumber would like to use American Plumber products, if possible. I am also concerned about significant water pressure drop with the use of a filter.
My plumber originally suggested a heavy duty 20” housing with a radial flow/GAC filter (100,000 Gal @ 4gpm, max flow rate 8 gpm). My concern is that the filter has a 25-micron wrap, and I thought the micron would have to be lower to remove TTHMs?? I thought a carbon block filter would work better, but I’m not sure if that is correct?
Help/postings are appreciated.
Thank you for the quick response. Ok, sounds like the plumber is right on with what he proposed. I am unfamiliar w/KDF, as well as this whole process. So, I want to put 2lbs of KDF-55 in the bottom of the cartridge, and then the rest is GAC? Is that loose or in a filter that fits a 20" housing? Thanks again.
Isn't there a difference between chlorine & TTHM? I thought TTHM was a byproduct of the chlorination process (done by our utility company). If we treat chlorine in our water, will it necessarily treat/remove TTHM? I have tried calling EPA, and I've researched this on the web...I can't seem to understand this issue, and the type of filter that would work for the whole house. I have emailed filtersfast, but any other information would be helpful as I try to navigate this process... Thanks.
Thanks, Andy. I think I understand that part. What I can't decide on is the type of whole-house (POE) filter, if one exists, we can use to take care of the TTHM problem. Some folks say a GAC filter will do the trick. Then others, like an email I received from Pentek (which owns American Plumber - the brand we were considering through the plumber) says a POE system will not reduce TTHM because the flow rate would not be slow enough. Instead, we would have to use a POU system w/a slower gpm rate. Then, the salesman for Sharp said they would install a POE system (that wouldn't affect water pressure) with a Calgon F400 filter specifically for TTHM, but when I looked that up, it is a GAC filter. I am finding conflicting information all over the place. The salesman wants to sell a unit. The plumber assumes all GAC is the same (and it may be). I guess that's where I'm at - are GAC filters similar, and if not, what characteristics do I need to look for in a POE GAC filter that will take care of TTHM? Sorry for the rant - I'm having a very difficult time boiling all this down. I appreciate your time. I haven't heard back from filtersfast yet...
Thanks, Roxanne. Ok, so my next question is... If we go ahead and pay the plumber to put in a regular GAC whole-house system to take care of color, odor & sediment, and then put in POU filters in the kitchen and showerheads for TTHM, is that really overkill and unnecessary? Is it not a good thing to "over-filter" the water?
Andy - thanks again - you have been very helpful.