Yes I am sure, certain towns, with an undersized plant (now about all) may require you to install a traditional tank to facilitate the job that the town's plant has to do (yes I know it's not fair as you pay taxes to have water treatment, and they won't pay if your tank gets clogged though...ah ah the assholes! But it's so), while for houses not connected to public sewage, like the ones in the countryside you have to put an himoff type not traditional only an himoff.
http://casa.uncome.it/articolo/come-funziona-la-fossa-biologica-6734.html
Thanks for the explanation,me I fully knew what it is for....
"The types of chemicals in drain cleaners are probably falling foul of increased consumer protection and environmental safety and even safety at work legislation."
Yeah...the usual Nanny state for the stupid folk tale...poor world.
-"Some caustic solutions may react very badly with old cast iron, steel and concrete drains and could dissolve the surfaces, cause pitting etc."
-People unaware of pipes materials...
It's good advice to discover what your pipes are made of before pouring any chemicals, that's one of the points I warned of initially...those are things you learn as you live in your house...
Knowing the power based on concentrations is somethinh you also need to know.
Bad reactions are not that common but possible,and anyway usually due to very strong acid not the stuff you find at the supermarket, acid and lead or alu is another example (just watch youtube, it's full of kids making bombs with alu and acid), but it all relies in using a right quantity and know what you're doing, cast iron are known to be problematic anyway.... and it's not like you do that any day also...that's why stronger or concentrated stuff is used by professionals...but the others are not that dangerous in the concentrations that comes....sure is that on the long run and if used often will potenetially damage...but that something you do once in awhile.
"And, as Laundress pointed out, there's a risk of a violent reaction in a sink trap which could blow up in your face (literally)."
And that's why is stated and warned in any instructions of these bottles to pour on a certain distance and wear protections, if you're so stupid or too lazy to do that anyway it's your business, if something happens no one to blame except yourself, the same if you mix acid and base or do potions or stupid things... as long as you were given the chance to be informed (safety labels) then it's really your own business and fault.
"There are also considerable issues with using liquid chemical drain unblockers or large amount of chlorine bleach or strong chemicals in general in septic tanks as you can kill off the bacteria that breaks down the sewage and cause major environmental contamination of ground water. "
Unless you use tons of pure and or very big amounts and every day it's not that much of a problem...
Also, it happens that sometimes the enviroinment in the tanks is too acidic and adding a base from time to time helps to keep a favorable ph inside the tank, often that is reached by detergents that helps keeping a fair pH, that's why our domestic tanks don't typically turn too basic or too acid because we have a sort of balancing in this sense, the results of an anaerobic digestion is infact an acid...
Other common problems in tanks is mixed waters....
You may sure want not to run rain waters and such into the tank (this is for urban homes with septic connected to sewers and or country houses without a drain field and percolation system, becuase many old country houses here don't have an underground drain field but drains either in a ditch/trench or stream or surface lower to the house and they had the rain directed in the septic hence no problem of overfilling/saturated drain soil, now of course you generally need to make an underground draining system and have rain drains separated to the tank) as it will rinse off much stuff before it's digested and will result in a clog more likely to happen, also will diminuish the qty of bacteria, unfortunately this is what I see happening many times in town (still happening now even though some more conscious builders don't, in the past it was just standard for urban settings and before treating plants)....our condo also directs all roof drain waters in the drain columns and end up in the condo septic tank...
In this town like many others (would hazard saying most?) we have a common "mixed" sewer, called "unitario"- "Unitary" no separate white/grey and drak waters, all goes togheter to the treating plant, storm waters both from buildings and streets are mixed with waste waters in the sewers and all gets treated (that is also why they want not to over-work the treatment plant and ask you to put a septic),...many big cities such as Rome Naples etc... also still use many tracts of sewers that were built at the time of the Ancient Rome or ancient times.
This is not the best attitude today but doing a change in that sense would mean cut down a whole town or city and a crazy amount of costs no one can pay, especially now that we're squeezed like lemons to please and get fat the fucking "EU" and the sold out pigs that are our italians politicians ...
[this post was last edited: 1/20/2015-12:54]