First I would like to say crystal clear water IN A POND is often a sign of deadly
water. real pond water is not perfectly clear without a lot of equipment.
shading in a hot climate can use shade cloth, or, put in water lilies and oxygenators
like elodea. 12 foot waterfall? you must lose a lot of water from that.
I use a veggie filter to keep my water "clear" altho that means I dont have pea soup,
but htewater is yellowish. Ingrid

On Tue, 12 Aug 2008 05:05:05 +0100, Vegaspond
wrote:-
I can not keep the water clear this year.
I live in a very hot climate 100+ all summer, the pond is in direct
sun
1200 gallons with 12 ft of water fall length, Pond master 4800 gph
pump with a Pond master pressurized bio filter with a 20 or 22 watt UV
light. the water has always been crystal clear until this summer

Yes about 15 fish