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Gents Toilet Flush Arrangement

With my Village Hall hat on, "How often should the Urinal in a Gents Toilet flush?

Originally the cistern was filled by a trickling tap, then I fitted a Cistermiser, which certainly saved water, but eventually the battery contacts corroded away. I fitted an external battery box and found that the valve failed to close. So need a new device.

The options seem to be:-

a) A trickling tap.

b) Another passive IR device. https://www.gentworks.co.uk/cistermiser-irc-sensor-with-ceiling-kit.html

c) An electronic timer with Bi-Stable valve (as also used with passive IR devices). https://www.gentworks.co.uk/cistermiser-irc-sensor-with-ceiling-kit.html

d) A non-electronic valve which reacts to pressure drop due to taps, wc cisterns etc - https://www.gentworks.co.uk/cistermiser-irc-sensor-with-ceiling-kit.html

But the other question is, "How often should the cistern flush?" Just once a day is 300 litres per month or 3,650 litres per year etc.

Thanks

Clive

0 Former Community Member over 4 years ago

AncientMariner:

But the other question is, "How often should the cistern flush?" Just once a day is 300 litres per month or 3,650 litres per year etc.

Water Regulations state that urinals should use no more than 7.5 litres per urinal bowl for a cistern serving two or more urinals (10 litres per urinal bowl for a cistern serving a single urinal) per hour.

Obviously if they are little used, you can flush them with a variety of devices - proximity sensor, non contact manual trigger with an hourly flush or even a temperature probe clipped to the outlet

Have you looked at waterless urinals ?

Regards

OMS
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0 AncientMariner over 4 years ago

The cistern serves two urinals, so my guestimate of 10 litres seems about right.

There is something about waterless that I am not keen on. So won't go there.

The IR options seem ideal, but with the last one not so easy to set up, ended up playing peek a boo, to check if it was sensing. That's why the straightforward timer version sounds easier to set up. The water pressure monitoring valve type could be good, but am concerned that the house next door on the same water supply pipe may cause excessive triggering. Hence my question as to how many times per day it needs to actually flush.

Clive
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0 Former Community Member over 4 years ago

I guess you have to put this into perspective

Even if you fill and flush at 15l and hour for evermore, then that works out at 130 something m3/annum - so even a very basic control makes some sense.

For a village hall application, I would just use a good quality solenoid valve and a decent combined microwave and PIR sensor and let it do it's own thing

If it gets more complex than that, it'll cost more than the water saved

Regards

OMS
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0 AncientMariner over 4 years ago

After some Googling, found a PIR unit which looks better than what has been used previously.

So a https://www.easyhygiene.co.uk/product/guvnor-pir-water-management-urinal-water-saver-system-guvnor/ should be with me later this week.

Should pay for itself during the next few months. I cannot shut the water off, since a small firm rents a room for an office and he is still working there.

Clive
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Gents Toilet Flush Arrangement

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