Morning all, newbie here. I own a small outdoor activity centre in London. My site is not connected to mains water or sewage and whilst i'm investigating the cost of connecting to the sewers, I'd also like to look at a septic tank. The nearest tap is about 120m away, so I'm thinking of getting water in by using a bowser, then either pumping the water into a water tank or letting gravity do it's thing. My centre is used mainly at weekends where I run 4-5 x 2 hour sessions. Each session will have upto 20 people. I would say on average 3 people per session need to use the toilet (for number 1's only) plus my 2 or 3 members of staff will use it, say 3 times a day each.
I'm thinking of having one toilet (pan) and one long (about 1m) urinal and plan to somehow use rainwater to flush these. Also want a foot operated sink for handwashing.
All waste to flow into a septic tank and then (apart from the solids) into a drainage field.
I've been looking at this, https://www.septictank.co.uk/Cube-Septic-Tank/ but I have no idea if it's any good. Don't want to do it on the cheap, but also don't want to get an expensive tank if I don't need to.
Anyone got an advice? Is there anything I need to be aware of? With regards to the sewers, I'm planning on going to my local council office to have a look at the sewage map and then take it from there. Any idea of costs to connect to the mains? Should I just get one of the many companies I've seen on the internet to do everything (application etc etc) for me?
Thanks in advance.
B