Thanks to TFP my water is super clear (it probably helps that no-one's been swimming for days because it's been so relatively cold here - the pool had dropped to 69F overnight). I remembered someone on the forums saying that you can tell if you've got clear water if you can tell if the screws on your drain cover are slotted or phillips head. I decided to take a look and went one better - I noticed for the first time that one of our main drains is missing a screw!:jocolor: