indika said:
that sounds good, yes I can manage a showel
can you point me in the right direction, web sites instructions etc..
Scroll down the page at this link ...
http://www.inspect-ny.com/septic/gravelless.htm
... and you will find some good information about "chamber systems". The link I posted here a couple of days ago (scroll up a couple of posts) shows the chambers I used, but there are other companies with similar products available. I got mine from a local supplier or septic components, or you might be able to find some at one of the big home-supply stores.
Like someone suggested to you in another thread, you should try to find out exactly what you already have ... but the county had absolutely no records of my own system when I asked before doing some repair work. Also, the local code office might be willing to come out and do some percolation tests and tell you how much capacity you need. My own chambers are 3' wide and come in 4' sections. With 3 or 4 people in a seasonal cottage, I can imagine a total of 24' (3' x 24' or 6' x 12') would be more than you could ever fill, meaning this:
One of the primary differences about chamber systems is that they can be filled with water during high usage and do not have to drain immediately like with perforated pipe ... and with cost being another biggie, they offer other advantages also.
Other than the matters of your property's ability to absorb water and the sizing of your new system, none of this is rocket science. If you already had an open trench for accepting the output of your septic tank -- go experiment a bit, if you like -- a chamber system then simply turns that trench into an underground cave you can cover with dirt on a day when you have nothing more interesting to do.