Add enzymes and they'll outlast your roof. - probably your house.
Houses are 1950's built for NZ air force staff. We moved them 150km from the original location on the back of trucks...recycled houses.
They are predominantly built from NZ native timbers with concrete tile roofs and will last as long as someone bothers to maintain them.
The problems with septic tanks here have been a lack of maintenance, degradation of the leach fields,unsuitable soils types and our high rainfall. A septic tank would be an Anaerobic system which is not as efficient as an Aerobic system at breaking down waste. (?)
For our vermiculture system the leach field is 400 sq meters.
The geology is a well decayed volcanic "rock", more like a silty expansive
clay in consistency over a bed of fine limestone. These soil types are inclined to be either extremely saturated or bone dry. As we are close to a very large tidal harbour, whose ecology the local county is trying to protect, the rules around waste discharges are strict.
https://en.wikipedia.org/wiki/Kaipara_Harbour
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The most important things you can do ?
Limit your needless consumption as much as possible.
Buy quality products with an eye to how long things will last rather than do they confirm to the the latest fashion trends. Recycle and reuse.
Wow!The section I bolded adds up to somewhere between very very bad and terrible!
Many regions in California would consider such a site as only inhabitable with a sealed storage tank requiring weekly pumping when occupied. (Big Bear & Lake Arrowhead come to mind.)
I've seen entire fjords where every building had been razed - these sites weren't far removed from the conditions that you're describing.
Free advice - if "D" boxes are included in your leach system add a liquid broad based enzyme mix to each box on a yearly basis - if not install below surface standpipes along the field and add the enzymes annually at these points. Your system is going to need to be in
very good shape.
Leach field enzymes have no effect on your tank but liquefy everything other than metallic solids and living roots that have entered the leach system.
Take your clothes to a laundry/laundromat & wash dishes by hand.
For any reading with a septic tank, the enzymes can simply be flushed down the toilet & dry enzymes are OK.
In sink "garbage disposals" add strain to any system.
Plant some trees close to the field.- get the moisture back into the air.
I spent 6 weeks in court defending enzyme use back when the concept was new. I've still a string of felony arrests that would make Al Capone blush - no convictions because enzymes actually work as advertised.
My breed of enzymes would liquefy a newspaper in <1 hr, and cause a paper cup to leak while holding it in your hand. The prosecution spent 3 weeks saying the products didn't work - then another 3 weeks trying to convince the court that they worked so well that I was ripping people off by selling them too much of it?
I could guarantee sink lines for 1 year & septic tanks for 5.
Best Luck!
Apologize if pedantic, but broad based enzymes were once a big part of my life.
Terry