Septic ejector tank buildup - don't think it's grease

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Chinook

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Augusta, MI
Lived in house for 5+ years with no problems. Now rent the house out and every 8-12 months there is thick, white clumps and build up causing float switch problems (multiple overflows). The matter is not waxy or greasy so I wouldn't call it "sludge". It's hard but can be broken apart by hand and floats. The problem with the float was that this stuff built up on it and it's size caused the float to get wedged between the tank wall and the piping. For clarity, it did NOT seem to keep the float submerged due to lack of buoyancy.

Anyway, looking for help to identify what this stuff might be and get some guidance to some solution. I've seen what grease can become in this type of setup and it doesn't fit with what I'm seeing here.

Only one bathroom in basement (sink, shower, toilet) flow into this tank; no laundry, no kitchen sink.

Picture shows the float on the left covered in the white, chalky substance.
 

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Could be grease from body oil, mixed with bar soap.

Can’t you just rotate the discharge pipe a little, to move the float into a more open area?
 
Is there a check valve on the ejector pump?
If not, maybe kitchen drainage is backing up into the pit.
Or the check valve is leaking, and also kitchen drainage is backing up into the pit.
Or maybe tenants are dumping kitchen grease down the basement sink or toilet, thinking that is better than down the kitchen sink.
 
There is a check valve after the pump. If it is leaking, you think grease might be seeping back in from the septic tank?

This stuff is not slimy at all. It's not hard like lime but hard enough to form a shell around the float and other surfaces. Breaking it apart reveals a somewhat dry texture. I didn't think body oil would be enough to cause buildups but I'm no pro either.
 
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I'm telling you it is grease. Pout some grease out of a frying pan into a container and let it set for a day or two and it will look and feel that same as you have in your tank.
 
I know what grease is like after sitting out. The grease feels... greasy, mushy, buttery. This stuff is hard and crumbly. I'm not saying it isn't grease but all the descriptions plus the fact that the kitchen sink does not drain here, makes me think it's not.

Septic was pumped this spring. I'll check the valve next and make sure there's no backflow.

Guess I'll try some additive and see if it breaks down the build-up.
 
Maybe just fossilized toilet paper.
Tell them to switch to a brand that is easier to break down, no extra strong type paper.
 
That is a grease ball, after it emulsifies with detergents and soaps. Still grease, and lighter than water, but the consistency is really changed.

You see it where folks are eating too much lard or other animal fats.
 

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