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01-19-2014, 08:59 PM
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#1
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Senior Member
Join Date: Dec 2012
Posts: 529
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Sewer problems
I know this may sound crazy, but when I flush my toilet little black gnats fly up from the tank. What am I to do, have never seen this before.
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01-19-2014, 09:31 PM
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#2
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Senior Member
Vintage RV Owners Club Texas Boomers Club Oklahoma Boomers Club Ford Super Duty Owner
Join Date: Aug 2000
Location: Full Time, TX Home Base
Posts: 19,079
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You have drain flies. The easy way to kill them is to mix a strong solution of chlorine bleach and water and put it in the tank. Let is set for a day with enough water to cover the bottom an inch or so. Fill the tank up and let it set another day or two. Then dump and flush. It should get rid of them. They probably came up through the open hose when you were at a campground.
Ken
__________________
Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot
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01-19-2014, 09:35 PM
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#3
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Senior Member
Join Date: Sep 2012
Posts: 4,232
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And be sure to leave your dump valve closed until you actually need to dump.
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01-19-2014, 09:41 PM
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#4
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Senior Member
Fleetwood Owners Club
Join Date: Dec 2012
Location: Arkansas
Posts: 10,182
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To get rid of them immediately and give you time to do the above flush with bleach try spraying a flying insect spray down into toilet. The chemicals might not be good for your toilet system but it works, I've done it.
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Tim & Mary Discovery 40X. Chevy Tahoe. RVM32
"I've been lost now, days uncounted..."GFR"
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01-19-2014, 09:44 PM
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#5
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Senior Member
Join Date: Jan 2011
Posts: 509
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Quote:
Originally Posted by TXiceman
You have drain flies. The easy way to kill them is to mix a strong solution of chlorine bleach and water and put it in the tank. Let is set for a day with enough water to cover the bottom an inch or so. Fill the tank up and let it set another day or two. Then dump and flush. It should get rid of them. They probably came up through the open hose when you were at a campground.
Ken
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Most likely correct. I never leave my drains open when at rv park because of this very reason. I'll drain them every few days if needed.
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2006 Mountain Aire, Jeep LJ, 900 watts of solar, boondocking life away! Volunteer Fire Fighter!
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01-19-2014, 10:02 PM
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#6
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Senior Member
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 19,926
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While most likely gained through the stinky slinky left open, it's not unheard of them coming down the rooftop vent pipe to the black tank. Bleach will take care of the flies, larvae and eggs.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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01-19-2014, 10:13 PM
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#7
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Senior Member
Excel Owners Club
Join Date: Sep 2008
Posts: 352
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Quote:
Originally Posted by TXiceman
You have drain flies.
Ken
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That's so much nicer of a name then what I've heard them called
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2013 EXCEL LTD 36RKM
2014 F350 Dually Lariat 4x4
Sir Reginald the Cat who lets Big Mike and Jean travel with him.
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01-20-2014, 08:53 PM
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#8
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Senior Member
Join Date: Jan 2010
Posts: 2,136
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After seeing cockroaches the size of teacup Chihuahuas living under a CG's sewer cap, I never leave the manifold dump valve open. We have two 40gal gray tanks and two 40gal black tanks, each with a 'T' handle and valve. All stay closed until it's time to dump. AFAIK, no 'drain' flies or CRs in any of the tanks...and I'd like to keep it that way...
Things really are bigger in Texas!
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Jan and Bob
'05 Monaco Windsor 40 DST - ISL / '08 Wrangler
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01-20-2014, 10:16 PM
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#9
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Senior Member
Join Date: Dec 2011
Location: Sebastian
Posts: 119
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Everybody always says "don't leave your tank valves open". I have never ever left my tank valves open and I have gotten sewer gnats more than once. It only takes one pregnant female getting past the valve to start an infestation.
How easy they are to get rid of depends on where they set up housekeeping.
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Susan in Music with Mizz Bizzy
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01-21-2014, 09:48 AM
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#10
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Senior Member
American Coach Owners Club
Join Date: Jul 2007
Location: SW Florida
Posts: 2,547
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We usually leave the gray valve open with no ill effects, but along these same lines, I've never understood the benefit of those hose slopes that obviously keeps the drain clear. I mean, now you've lost a natural water trap, like most every sewer drain has in some fashion and has to help, even if the CG's sewer system has a trap at each site.
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07 Revolution LE 40E_1 1/2 Baths_Spartan MM Chassis_06 400HP C9 CAT_ Allison 3000
Dinghy_2010 Jeep Wrangler JKU ISLANDER
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