"Pex" is turning green inside

Hey all,

came here many a time for diff stuff over the years - just never registered - great site !!!
I spend a lot of time over at the John Bridge Forums - ex Tile contractor - hence the name.

nuff small talk - here is my situation:

have "pex" opaque (white) lines in my home that look to have some kind of bacterial growth in them.
7 year old home on a private well & septic - here is your form on my setup:

Type of pump?
Submersible___YES_____
Two wire (no control)____?____
Three wire (control box)___?___
Wire Size____?_____ Wire Length____?____
or
Jet Pump (above ground)_________
One or two pipes down the well__?__

Size of Pump?
Motor Horsepower?___1HP_______
Pump Model #__FLINT & WALLING 19GPM____________
Date Pump Installed____5/27/05______

Pumping from?
Cistern tank___________
Pond, lake, river________
Water Well_____YES_______
Depth of well___98'_______
Depth to water____25'_____
Pump Setting_____?_____
Pipe Size___4" TO 90'______"
Drop Pipe Material
PVC____YES 60' LENGTH____
Steel_______
Poly________

Well Recovery Rate___?____gpm
Well Casing Diameter___4____”
Rock Well__________ Sand Well__________ Other______________
Date Well Drilled_____5/27/05_______

Well Casing Material
PVC____YES____ Steel_________ Other_________


Pressure Tank?
Bladder or diaphragm tank (one pipe to tank)____YES______
Size or model of tank_____WELL MATE- WM14-WB_______
Air charge in top of tank, with pump off and water drained_____?_______PSI
(check with car tire gauge)
or
Plain Hydro Pneumatic tank (two pipes to tank, one in and one out)_________
Size of tank________________

Pressure Switch Setting?
On 30, off 50 ________
On 40, off 60_________
Other_____ON 40 OFF 55__________

Pump Control Method?
Cycle Stop Valve model #_________
Variable speed control #__________
Pump Start Relay (sprinkler timer, no tank)__________
Manually turned on and off____________

Pump Protection
Cycle Sensor_________
Pumptec_____________
Low pressure cutoff switch (lever on side)__________
Other_______________

Filters or Softeners____RO SYSTEM & H2O SOFTNER__________
Before or after pressure tank____AFTER___
Type of filter_________?__________
Bypass available_____YES___________

Water Used For?
House Use___YES____ Number of baths____1___ Number of People___1_____
High Flow Showers___?____gpm?
Plus/Or
Irrigation with timers_____YES - 12 ZONE 60 HEADS___
Irrigation with hoses________
Heat Pump______gpm?


Problems Experienced
No Water_________________
Water only part time________
Water at all times but weak_____
Air in water_______________
Pressure surging___________
Water Hammer (noise)______
Too Much pressure_________
Other_______PEX LINES ARE TURNING GREEN_____________


Pump makes clicking or buzzing sounds________
No Sounds______________
Pressure gauge reading____42.5____psi
Other____________________________________

also: Geological mats:
sand 0-31
clay & stone 31-87
water /sand 87-98


WESCO S/S screen
4"
slot size - 12
length - 8'

Do you have, and know how to use
an Ampmeter and Voltmeter________YES__________

Describe Problem__________________________.....

I know I probably need to chlorinate the well - would be the first time
getting water tested at an independent lab tomorrow.
anything I should need to know before I attempt this.

btw - read lots of threads on chlorination so I think I have the correct procedures down

Have you seen alot of this in the field?
what could be causing this?
should add that it is mostly in the cold lines only

here are pics:

Did I see that one but not the other is discolored? Is that the hot line turning green?

If so, could be you have an algae bloom in your hot water tank. What temp do you run it at?

Does it stink?

Yep, mainly on the cold side lines
flushed the w/h last week with 1 gal of vinegar - let sit for 6 hours then flushed (not into septic)
anode rod was cut off when the h2o softner was installed 7 yrs ago - bought a new one - will install
hwh temp - not sure but i bumped it up after the last flush - it's an A.O smith with the electronic controls with the diff colored light scale
doesn't smell any stronger/weaker than it did when I moved in
but have noticed that I am getting rust colors around the drains - never had before

Shock chlorinating is good. http://www.water-research.net/shockwelldisinfection.htm has useful info including 4 inch casing has 0.65 gallons per foot of water. Do it before serious winter, if there is time. It is going to get cold tomorrow. Get some chlorine bleach, and depending on the well and how much water you are able to feed back in to the top of the well, it may take a long time for the bleach to circulate. Check your messages.

The rust is probably coming from inside the tank, since you don't have a proper anode. It may be too late to put one in now.

If there's more algae in the cold lines, though, that does suggest the bloom is in your well.

Winters here - got 5" of snow already
high of 9 low of -11 tomorrow
may have to wait till a warm spell
as I suspected the growth is from the well - darkest line is the feed line directly from the well
now have to find the cause

Personally, I would avoid using hypochlorite (bleach), you will develop disinfection by-products (some regulated, others not); this is common in disinfected potable waters.
Try KPMS instead, it's a selective oxidant, with the final reduction product being sulfate.