A layer of scum & grease form on top, floating stuff.
A layer of dirt forms on the bnottom - stuff that doesn't 'digest', like dirt from your fingernails, clothes washing, etc.
The middle is mostly sludgy liquids that are digesting just like your tummy does, and the liquid results drain off into the leach field.
You want to get it pumped before that bottom layer of solids builds up to start running into the leach field. If those solids do flow out into the leach field, they plug the lines, and you need a new system.
Everyone's lifestyle and tank size is different, so there is no one 'rule' of how often to pump it. Some don't make it 2 years; others can live 25 years and never fill up the tank with solids. But, _everyone_ does add at least a tiny bit to the solids at the bottom of the tank, so _someday_ it needs to be pumped out.
I'd think it would be a good idea to have it pumped out in 5 years anyhow, and see where you are at. Hopefully the good septic guy you hired knows his stuff, and will tell you it wasn't even 1/2 way to needing it, and then you know for the future, how long you can go between pumpings for your lifestyle.
If you wait until you have troubles, you have $$$$ troubles at that point, because you damaged you leach line. If you pump too soon, you waste money on something not needed.
In my state, law says you need to pump a tank every 3 years, needed or not. I'm sure someone in the 'Cities on a sewer line came up with that law, but there it is....
None of the additives are worth a hoot, yeast works with oxygen, while a septic tank works without oxygen, and the majic powders are just bugs that a healthy working tank already has from your tummy. If your tank isn't working right then the majic poowder isn't going to fix whatever the problem is, you need to fix the problem (too full of dirt, or too much water, or something going in that kills all the bugs....).
Keep the level of dirt at the bottom of the tank manageable (needs pumping every 2 to 50 years, depending on your lifestyle....), keep the harsh chemicals put in the septic system to a lower level, and that is basically the 2 things you need to do with a septic.
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Today's Featured Article - Two-Brush Generators - by Chris Pratt. Whether for product liability or because the aftermarket parts and labor business is lucrative, this concept is disturbingly prevalent. Fortunately when you step into your shop and make that jump 50 years back in time to work with your old tractor, this concept goes out the window. Even so, when it comes to the charging system, people quickly revert to this idea and start replacing the major components one at a time until it works. The reason you don't find any decals in your replacement set wit
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