Saturday, 26 May 2012
We have had the pumps turned off for the last 4 days in order to kill the biomass in the filters. Today we flushed out to waste the dead biomass and it's contained nutrients. This should reduce the phosphate level in the pool along with other nutrients accumulated by the algae in the filter. The water has remained clear while the pump was turned off. In fact the water remained clear during winter last year as well when the pump was not on - that was before we had the natural filter. But as soon as the weather warmed up the pool went very green. Ralf says we can leave the pump turned off now for the winter! If there is any problem we can always turn it on again. This of course reduces the cost of running this pool even further! We have baby fish - I have counted at least 11 and they are three different sizes- so three successful batches. They are so small -like mosquito wrigglers- that there may well be more that I haven't seen. So come summer we should have quite a display of fish in there. I can't wait for snorkeling weather! There are aphids on the water lilies and lotus. I have been washing them off by submerging the leaves and giving them a bit of a rub, but they then float on the water tension and I suspect spread around the pool. I haven't seen the fish eating them yet but hopefully they will discover the aphids soon. There is a Surphid fly hanging around the leaves and I hope it is predating on the aphids. There have also been a wasp and a spider on the leaves so maybe we will breed up some predators. If anyone has any other control they can tell me about please do so. Of course insecticides are out of the question because of the frogs and fish. There are new froglets emerging now too. That makes three different species we have seen emerging from the water. And judging by the feathers floating on the water we have had guests there before we are up in the mornings. How many chlorinated swimming pools give this much interest and pleasure in winter time?!