Septic System - Mushroom Clog

Has anyone experienced mushrooms growing in the discharge pipe from the house to the septic tank - right at the outlet to the septic tank? Or Better yet - does anyone have any recommendations for eliminating the mushrooms from the discharge pipe? 3 times since Christmas 2005 we have had our discharge pipe clogged up at the outlet to the septic tank - stuffed with mushrooms. We haved talked to people and get a quick simple suggestion: Chemicals / Rid-X ... Because of the nature and location of the problem I am unsure either will resolve our issue and I am very hessitant to use chemicals. The mushrooms completely clog the end of the discharge pipe. If we were to routinely (monthly) use treatment chemicals - they would simply drain right down the discharge pipe and drop into the septic tank - probably never touching 90% of the circumference of the pipe thus non-effective as the mushrooms can clog the pipe in less than a month. On each case we have had to snake our way out from the house to the septic tank. Then once through we have wired up some coat hanger and tied a rope to pull the end of the snake back and forth to try and detach the mushrooms fromt he last foot or so of the discharge pipe.
We have had the house for 5 years and just had the holding tank pumped in mid December. Oddly enough - that is when the problems began - but I do think this is coincidental. We haved called the local septic place - but they have never heard of such a problem (they can't say that anymore).
Anyones suggestions are appreaciated.
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Suggestions, some better than others
Get a cheap drain cleaner from harbor freight, install some cleanouts (if not already done) and learn to DIY. Not a great solution but one that controls cost. http://www.harborfreight.com/cpi/ctaf/displayitem.taf?ItemnumberF769
After cleaning, have a video inspection done to determine if there is a crack allowing soil intrusion or an uncleaned section. Any remaining fungus will just reinnoculate the pipe and it will happen again. Mushrooms often grow on decomposing roots of trees. make sure that has not made its way into the pipe.
If you can somehow disinfect the pipe without killing off everything in the septic tank that would be best but this is tricky. A weak solution of copper sulphate will kill the shrooms but I am not sure if that would be safe for the rest of the septic system.
Can you cap off this pipe, fill it with a strong fungacide, let it soak and then drain it (to the pump truck). A strong solution of bleach or copper sulphate or a commercial solution should work in this situation. You may need to pour it in the house drains to get everything before the septic tank.
Just wondering. Did you ever send fresh shrooms from the store down the garbage disposal? Probably not that, spores must have entered the tank from soil when it was pumped the first time.
Septic tank chemicals generally enhance decomposition by adding nutrients or microbes or enzymes. They usually do not kill anything and are not actually cleaners at all.
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what does rock salt do to a septic? i have city sewer but use salt to stop root growth in a bad line with roots
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What is silica sand used for? I have 4 25kg bags that were left at my house by the previous owners.

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Whoops!! Wrong thread...

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Jon wrote:

bacteria that process the wastes in the tank. This is one reason why many communities prohibit water softener wastes from septic tanks, and the mineral heavy effluent from RO systems is similarly banned.
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