speak to ruben ,
that a reasonable amout of water for a 40x40, you should be able to fine tune it with your valve set up , ie increase or lessen waste it may help a little ,
on our systems we allways fit a 12 volt booster pump which means you can produce about 4-5.5 liters aminute between 240- 330liters an hour ,
iam sure ionics will give you the help you need