Installing a grey water system to save an ancient septic system?

Please forgive me if this is very obvious, or has been discussed a million times already, but this stuff is somewhat new to me still.

The situation is that I own a small home with a 35-40 year old system which functions with attention and care.
My idea is if I divert the grey water to the garden--another thing to research---would I be enhancing the life of the old system or not?
And is there a way to figure out how much water it needs to stay the most functional?

Am thinking of finding a way to flush with grey water too, as part and parcel of the project.
New designed and installed systems on that site will run me 30k, hence my wish to lesson that hit.

Susan,

Not sure exactly what you mean by keeping your system functional?

Are the lateral lines the problem? clay pipes, trees, etc. ?

You can feed the bacteria in your system or even use baker's yeast.

Justin

I would look into the geology of your area. I was lucky to find myself in a sandstone area, and we put in a drywell to ease the stress on an old system. If you are on limestone, you may just be dumping greywater back into your well. Drywemk DIY was simple but lots of work .