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PostPosted: Fri May 11, 2018 10:08 am 
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Upstairs bathroom sink drains very slowly. Nothing blocking the plug hole, being a bathroom it does get biofilm buildup around the drain but I clean this regularly, looking down into the trap now it is spotless white pipe.
Plunging seems to make a difference but only for a few days and then it slows again.

Any ideas before I start stripping out the waste pipe?


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PostPosted: Fri May 11, 2018 10:26 am 
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do you have people using the sink with long hair ??

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PostPosted: Fri May 11, 2018 10:44 am 
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Greasy gunge - usually non-dissolved soapy products. I'm guessing your trap isn't the standard u-bend but one of those 'compact' straight versions???

I use the palm of my hand to give it a 'plunge' every couple of days and it tends to keep it clear.

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PostPosted: Fri May 11, 2018 11:30 am 
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big-all wrote:
do you have people using the sink with long hair ??


Not particularly long. A strainer is used to trap hair. Some does make it to the gully but I clear that often too.

kellys_eye wrote:
Greasy gunge - usually non-dissolved soapy products. I'm guessing your trap isn't the standard u-bend but one of those 'compact' straight versions???

I use the palm of my hand to give it a 'plunge' every couple of days and it tends to keep it clear.


No it's a standard U bend and it's perfectly clean at the trap end. I guess the problem must be further down the line.


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PostPosted: Fri May 11, 2018 2:03 pm 
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You could try caustic soda, careful though as it needs handling with caution.

(do not confuse caustic soda with soda flakes)

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PostPosted: Fri May 11, 2018 2:17 pm 
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I have plenty of caustic soda on hand, will give that a try.


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PostPosted: Fri May 11, 2018 10:56 pm 
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Its a bit late now, but DO READ THE INSTRUCTIONS.

You mix it in a bucket of HOT water then pour it down said plug hole. If you pour it in cold, it can set like concrete. (No, it wasn't me, but I lent him a drill to drill holes through it, and it worked)

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PostPosted: Sat May 12, 2018 7:00 am 
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NOOOO you never add caustic soda to HOT water! ::b ::b


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PostPosted: Sat May 12, 2018 7:24 am 
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Rorschach wrote:
NOOOO you never add caustic soda to HOT water! ::b ::b


You can add it slowly to hot water but you can't add hot water to caustic soda.

Used tons of it on 2 stroke exhaust when I was a lad

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