Anyone see grout turn black and get holes like this?
- Thread starter Rich G
- Start date
How old is the pool?
Do you have a septic system?
Is the ground always wet?
Is the problem just in one spot or everywhere?
Do you have a septic system?
Is the ground always wet?
Is the problem just in one spot or everywhere?
2 years
Yes (80ft away)
Not always but it’s been raining alot
Just a few spots but all on the same side of the pool
Maybe a septic system backup?
If you're getting bacteria migrating through the ground water, it might be saturating the area under the deck and going through the grout.
If you're getting bacteria migrating through the ground water, it might be saturating the area under the deck and going through the grout.
If I didn’t know any better. And sometimes I don’t, pic #2 (the one with no feet). looks like it was burnt. Like something arc’d and blew the hole while doing so. You got the dark stain and the brown stain at ground zero with fresh grout around the hole. Pic 3 has the blowout hole also. 80 ft is too far for me for sewage. It would possibly stain if it did but it wouldn’t make the holes.
Bacteria can do some crazy things. The smell is a good indication that it's bacteria.
If you dig a hole outside the deck behind the bad grout, is it black and stinky?
When is the last time that the septic system was serviced?
If you dig a hole outside the deck behind the bad grout, is it black and stinky?
When is the last time that the septic system was serviced?
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If it’s sewage related could methane or similar have built up under the patio and blew out the holes once the pressure got high enough ? Maybe those were weak spot to begin with and gave first ?
Bacteria can create acids that can damage anything susceptible to acid damage.
Many of the foods you eat cause the bacteria in your mouth to produce acids. That's what causes cavities. Not sugar or acidic foods.
Many of the foods you eat cause the bacteria in your mouth to produce acids. That's what causes cavities. Not sugar or acidic foods.
