Using the disposal point might simply involve removing an inspection cover (a light galvanised steel one usually rather than a heavy cast iron one ) and if there is no dedicated tap available, filling a suitable clean container (plastic milk bottle for example) from a drinking water tap to rinse out the toilet tank.
Whatever type of CDP you use, put the spout cap in a Safe Place before you start!
If the campsite uses the main sewer for toilet chemical disposal which most commercial sites do, they will usually stipulate that the general waste water can be disposed of in the same manner at the same location. However, some smaller sites will have only a septic bell tank buried in the ground with a removable lid to which the site owner will stipulate that only toilet waste can be disposed of merely because it costs money to have the tank emptied when full so waste water will fill it quicker thus being less cost effective. The waste water is then usually disposed of in the hedge unless a designated waste water emptying point has been installed on site specifically for that purpose.
There seems a bit of confusion here in "Septic tanks" and "Cess pits".
The latter, is just a sealed holding tank that does require its contents to be taken away when it is full. So with these putting in too much water becomes expensive and requires frequent emptying.
Septic tanks are very different and feature a level of natural biological digestion before the fluid is drained away into the ground. Here there are issues, one is with the multitude of chemicals added to our water, some can poison the bacteria doing the digestion leading to foul water draining into the soil.
Another major issue is changes in the amount of throughput. The bacteria find a balance for the amount of digestible product they are seeing, but if say at a Bank Holiday, there is a big influx of visitors then the amount of waste can't be digested by the colony size that resides in the septic system, so again unprocessed waste leaches out into the ground. It takes a few days for the bacteria colony to breed enough to cope but by then the Bank Holiday is over.
Many rural sites here and in France have septic systems of various designs and here there will frequently be notices saying some chemicals are prohibited. Septic systems do in the long term need emptying of undigestable sludges, but this can be after many years, all depending on sizing and design.
Site i am on dosent like you to use Toilet fluid with Formaldehyde. If you are on a site with its own muck tanks etc,The folk who pump it out do test on the contents,If it has this Formalehyde in the contents,the site gets charged £800 to get rid of it!.I was told that this is going to be banned, so wait and see.
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