I considered installing a Intelliflow variable speed pump to save on energy costs, but unfortunately I was given what Aussies call a 'bum steer' (look it up ) on the price so I went with a significantly cheaper variable speed pump that is available here in Sydney, the Hurlcon Viron P320. This pump has 3 speeds that can be set by the pool owner, but the factory set speeds equate to (according to manufacturer's data):
Low: 128 Lpm (28 gpm?), which runs at about 160W
Medium: 206 Lpm (45 gpm?), which runs at around 450W
High: 320 Lpm (70 gpm?), which runs at around 1100W
I figure I should be able to run a 8-10 hour low speed filtration cycle, which should provide 1 turnover. I don't have a flowmeter so I can't verify the above flow figures. Given my very ordinary plumbing setup I would be very surprised if I'm getting anything like the higher speed flow figures, but low speed should be pretty close?
Now to the topic of the post. When running the pump at lower speeds, not all the bubbles are being flushed out of the SWG and a larger bubble is forming in the top of the cell housing.
The SWG manual specifically states "WARNING: It is essential that pipe work and equipment do not allow gases generated from the cell to collect and build up", but I've read TFP posts where others are running with similar bubbles without worrying about it. Is running the SWG like this likely to damage the cell or cause other problems?
I rang the tech support for Hurlcon and they were pretty useless - their suggestion was to either turn down the SWG or turn up the speed of the pump. Thanks guys, I'd already worked that one out.
Whadya reckon? Should the bubbles be a concern?