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SeaKlear 'Natural' clarifier is sometimes mentioned in these forums, perhaps as one of the least-worst of the undesirables. It's a chitosan clarifier, and it's blue. I asked SeaKlear why it's blue, and is the dye (I assume that chitosan is colourless) biodegradable. They replied that the dye is...

We have a pool light some 9 to 12" below the water level. I think it is a Certikin PU6. It was fitted in 2008 so it the old sealed beam type. It has a protective cover behind which lurks some ugly algae. The cover is a loose fit and will spin round but be blowed if I can see a way of removing...

For reasons we won't go into our pool has been neglected for two years. One of the ensuing problems is that is has scale, presumably calcium scale, on the liner. The (spring) water here is very hard. At first I was encouraged as some of the scale is quite soft and can be brushed away with some...

I have upgraded my pump, filter and pipework to a design that requires a low flow rate (don't ask, I will explain but that's not the question). I need 5 cu mtrs (1,315 US gall an hour, 22 USG a min) across the filter. I have installed a Certikin HPS031M 1/3 HP pump which gives 6.3 cu mtrs/hr at...

For twenty years we had a sand filter with a lid and nothing else, no gauge or air relief valve. Now we have a new filter that has both of these. On startup yesterday I vented the filter to the point of water coming out of the valve. This morning I can see that air has accumulated and I can see...

Anyone know what this is? http://www.ocmproducts.com/purge-filter.html There are announcements from getting on for two years ago, and nothing since. I've no idea what it is. And as a followup, anyone with experience of OC-1 filter media? I am changing pump and sand filter and I want to use...

For several years I have used Tesco's thin bleach as a chlorine source: with a content of 1.5% sodium hypochlorite it is easy and very safe to handle, and cheap too. However it isn't so good when I need to shock, as I do now: I would need a trailer-full of bottles. So I have bought some 14-15%...

Hi, With the blisteringly hot weather we've been having over the last few weeks (in the UK) we decided that when the pool hit 21 deg C (a gnat's elbow under 70 F) we would brave a dip, and set a new early-start record. We have a cover so the pool is effectively solar heated. Yesterday evening...

I have the standard comparator to test FC up to 6 ppm (or so it's marked) with DPD1 tabs. I've known for some time that there are DPD2 and 3 tabs available, but I've ignored them. Now I understand that the 2 and 3 tabs can measure combined chlorine, which DPD1 doesn't. Can I use these tabs in my...

Bear in mind that we don't have such sophisticated test kits here in the UK. I'm using the DPD1 tabs in a colour comparator to test for FC (and Phenol Red tabs for ph). With the standard kit that every pool store sells the range for FC runs up to 3 ppm. The comparator in the Palintest kit has a...

I ordered a multiport spider gasket some time ago and now's the time to replace it. I've opened the multiport and the old and terminally damaged spider gasket has six spokes. The new gasket has five, but otherwise appears to be the same dimensionally. The valve has, of course, six sectors. One...

Just having come through a massive algae attack, I am pondering why can't we filter live green algae, only the dead grey stuff? When the pool was a deep British Racing Green I had my sand filter filtering 24/7 and in the morning backwash there would be a derisory amount of green algae removed...

Hi. I'm using a tablet-based comparator test kit, on a 13,500 US gall pool. My inital tests read FC 5, pH 8.2, CH 220, TA 100, CYA 90. I'm trying to get the pH and CYA into line. I've dumped (and replaced) 12,500 litres of water and the CYA has fallen to around 75, so I'm on my way with that...

Hi, I am fortunate enough to have - since mid 2009 - an Abrisud low-profile cover on my pool. We've had the pool for many years in its open state. The cover is a low arc made of an aluminium frame with double-walled polycarbonate sheets. It keeps the dirt out, locks children out, keeps the wind...

Hi, For some years I have been using the DPD1/Phenol Red tablet test kits to test the FC and PH of our pool. At the moment I am getting FC at 3+ and PH exceeding 7.8 (despite regular ph-lowering dosing). I have tried using 5 in 1 test stips, but with no great confidence, they always seem to...