High iron - failing filox system
Howdy out there.
New place, new well, pissed off girlfriend and kid! My water has high iron and is hard. My first concern was getting the iron out and filox seemed the answer.Water seemed good for a month or two, but the iron ppm continues to rise post-filter(currently about 7ppm).
When researching why filox fails I came across an ORP test (pot./perm. solution) that can be done without an ORP meter.Wish I'd known about this test before I bought my system because my water really fails the test.
The well - 128', 5" pvc casing , 22' static level, flowed 22gpm, water temp. mid 40,s F. It was sized to service two homes.
The pump - Grundfos constant pressure 15gpm(max.) set at 60psi.
The water - The raw water has a light yellow tint and and is slightly stinky.When sitting overnight it turns a lovely shade of orange and develops a rainbow sheen on the surface(iron bacteria?)
I had a water test done by NTL.
Calcium ----------------50.2 All in mg/L
Hardness---------------170 (9.9 grains)
Sulfur - none detected by one of those glass tube home tests
pH - 6.5 by NTL 6.8-7 by others on site
The system I installed.
Starts with a 4.5"X20" 5 micron prefilter to a check valve to a inline mixing valve to a 10"X54" air treatment tank (AerMax) to a 10"X54"1.5 cu.ft. Filox iron filter. The filter has a Fleck 2510 control. It was set up to backflush for 12 min. and rinse for 8 min.
I also installed a Stenner adj. injection pump to inject bleach ahead of the air tank during regeneration(aprx. 4ppm). This was suggested to refresh the media bed and control nasty growth.
I,ve spent hours researching (thats how I found you folks) how to fix this but there seems to be alot of Catch 22s with high iron water treatment.I,m tired of talking to salesmen sitting at a desk!
Any ideas on how to modify/change/upgrade this system would be much appreciated.
A reply! thank you thank you
Thanks much for the reply.If you don't mind, I'd like to pick your brain since you have a working system.
Backwash- My filter is set to backwash every day and it flows at 11gpm during. I like the fact that you're keeping your backwash to a minimum to reduce adding more iron.Makes sense to me, but how did you come up with the correct time? Would I look at the discharge and stop the backwash when it starts to clear up?
Chlorine amount- Is your chlorine ppm dosing the full ratio (1 to 1 for iron I think) or are you doing a partial having the filox remove some of the iron?I came up with a dosing of 13.6ppm (iron+mang.+1ppm residual) which seems like alot.
Sounds like I'll need to get a pulsing flow meter to convert to continous injection regardless.
Carbon filter- I agree I'll need one of these as long as hard water won't foul it.I can't seem to find any
info. on this. Also, are you doing any thing post filters to remove THMs? This is my main concern with a chlorine system and from what I read, carbon will only reduce them somewhat.
Locaton of my cartridge filter- I put it 1st to protect the equipment down-stream mainly for warranty reasons. I could move it between the filox filter and carbon filter to help remove some of the precipitated if that would increase the life on the carbon.Some of the filox systems out there require one post filter, mine did not. Any thoughts on this?
Filox media- Have you ever heard of a way to 'test' the media ? This stuff isn't cheap and if it's already ruined, ouch! I did pull the control valve to take a peek and found the freeboard (I think that's the right term) decreased from 16" to 13". So either my filter is making filox and I'll be rich or I've got a lot of crap in it. I'm betting on the latter!
Rentention tank- I'm tight on space. I'm trying to get more info. on Auto. Pure Waters 12'X60' mixing chamber one. Anyone out there using one of these? I thought I hit a thread on these but I can't find it again.
The online store I bought my system from hasn't been overly helpfull. Alot of "not sure" "don't know" .They did suggest I "might try amending the pH" due to my manganese. Wish they would've suggested the ORP test that shows filox alone will not treat this water.
Thanks - Muff