I get you now - thanks.

I was thinking of something a little simpler - your views would be welcome.

I was thinking of bringing mains straight into the botttom of the tank (via
a lock sheild value & a pre-filter (just to stop any cruude from the main
(not biological) at a drip rate to give me a 30% water change over the
course of the month. This I worked out to be at 0.5 litres per hour. An
overflow at the other end of the tank would go straight to waste (with some
traps etc). I summised that with such a slow rate it shouldn't cause a drop
in temperature & the chlorine shouldn't be a prob? Am I way off the mark?

tia Sky.


"Fishman" wrote in message
...

"SkyCatcher®" wrote in message
...
I like the sound of this but why did you filter the water in the
overflow
&
put it back to the tank? If you had mains plumbed directly in would you
not
just overflow to waste - or am I missing in something?

tia,

Sky.

The overflow point in filter tank was at the input (pre filtered) end.
(This is essential because if the filter beds clog and water cannot pass
through the filter tank you'll have an almighty mess.)

The water going to waste (that which overflows from the filter tank) is
just
a percentage of the water that has just overflowed out of the main tank
and
entered the filter tank.
The bulk of the water that enters the filter tank passes through the
filter
beds, gets heated / airated and then is returned back to the main tank.

The filter tank was 48" x 12" x 15".




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