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FWIW, just sharing my recent experience after starting up testing again. Have a 10-15-year-old TF-100 test kit. Stored in the basement at very constant room temperature in a closet all the time, and there's no sign of degradation on any of the reagents. Only the the DPD powder has turned grey...

Thank's for answering guys! Sorry, I made a translation error, with "Natrium hypo" I meant sodium hypochlorite. It would be rather expensive in Sweden for spas compared to Calcium hypochlorite. Calcium increaser = Calcium Chloride, CaCl2. I think this gives more of an exothermic reaction with...

I'm just about to start with a small Spa, and will probably use a combination of dichlor and calcium hypo. Can't use natrium hypo cause it's not economically available in Sweden except in too large quantities for a spa. With a spa I understand I need to add chlorine pretty much daily, or at...

Reviving my own old thread with aftermath and some questions. My algae problem continued through the seasons 2013 to 2016. I did several improvements during these years – changed to larger pump with sand filter, increased tubing size, added a very fine filter bag to the pool inlet when...

Thx, I'll try with poly also, and a lot of brushing might be more important if I have bad circulation. No outbreak right now, I've emptied and cleaned for start of season. Will fill fresh water now. How about algae under the liner, can it pass through?

Yes, it seems I managed to stop it by shocking at high levels and brushing, but it kept coming back several times, and it seems to have a bit low sensitivity to chlorine. - starts growing at FC 2ppm (CYA around 10) - passed OCLT at FC 12 ppm several days (CYA 20-40), but still growing I saw...

Opening this thread again, to give some feedback to the forum and maybe get some help. I took a sample of the brownish slush to a lab last autumn, and had some pictures taken, see attachments. They definitely identified it as green algea, but could not say exactly what species. So, I´ve got...

Many thx for your replies! I have at least a km to nearest industry or agricultural site. There´s nothing I know of that give large waste into air. Have no signs of downfall on the cover. I´m no expert, but have no ideas of what could possible be coming from the atmosphere. Ideas of what to be...

To Duraleigh: Ok. I greatly appreciate the answers from all of you! Very near end of season now, but will try spraying the liner when I refill next spring. Odd though that I should have stumbled upon a situation not seen before, more likely after all that I´m doing something wrong or...

I´m using the TF-100. When I had algea problems last year I got help from a friend to bring a test kit back to Sweden from the USA, since it can´t be bought in or shipped to Sweden. Yes, that is also how I interpret the pool school, and this is the KEY issue for me. But for me algea DOES GROW...

6th day of shocking - still growing I still have some algea growth on the 6th day, although very little know. Is it normal that is takes this long to kill it? Here´s my logbook: 15/8 19.00 pH=7,5 FC=1,5 CC=0 Visible algea on bottom and sides (started growing a little a week earlier)...

Ok, thanks for the clarification on clear water. No, I don´t pass that test :( . Last season I had some algae growth from beginning of August till closure in mid september... I always keep the pool covered by a blue solar blanket, day and night. This can explain the low loss of chlorine? I...

Thanks for you help, Jason. Either I don't get it right with the Shocking your pool process, or it doesn't work in this case. The three tests: - CC is 0.5 or lower: Always below 0,5 this season - An overnight FC loss test shows a loss of 1.0 ppm or less: I have a loss at or below 1ppm...

No automatic chlorination. Only manually added (trichlor, dichlor and calc.hypo). Measured today at 17.00 with TF-100: CYA below 20 (lower than expected) FC 15,5 - still above "mustard shock level", and no chlorine added since the 300g calc.hypo yesterday afternoon. Algea is still growing...

Measured this morning: FC = 16,5 => I have a slight measurement error, but still seems chlorine consumption is very low. OCLT passed. Water is almost clear, with a green tint.

Just like last year, I now have algea problem at the end of the season. Have read "pool school" and some posts on the subject, and have a few questions: - Is it common to have a very low chlorine consumption during an algea bloom? (My chlorine consumption last week has been 1ppm/24h). - Can...

Thx for you reply. No, I don't live close to a farm or industry. Summary as I see it now: - High FC levels seem to slow down the deposits, but doesn´t stop it completely (constant FC level above 20ppm for over a week) - I had FC down to 0 and CC of 2 ppm in the beginning of this problem 6...

Yes, I use the 10ml sample size. Yes, I have brushed the pool several times. The three criteria: 1) The water is clear (clears up in a day after brushing the pool) 2) Overnight FC loss: performed three tests yesterday evening and three tests this morning and compared the averages in order to...

Finally got a TF-100 test kits - algae or what...? Hi again, Now I finally got hold of a TF-100 test kit with the good help of a friend. Here´s my values: CYA: 40 FC: 21 CC: 0 Alk: 70 CH: 200 pH: about 7,3 (not measured recently due to high FC) Temp: 17C (63F) Recent history: 21/8: Algae...

The water is clear, but with deposits forming on the bottom. After scrubbing, the water gets somewhat cloudy and green. Filters darkgreen. Pool sides are NOT slippery. Typical algae? No other way to measure at present. Calculation of added CYA, see first post. Best guess is about 3kg tri+di...

Thx for your replies. For shocking, I can go back to using cal-hypo. Bleach is expensive and in low concentration over here. I knew strips were bad, but not THAT bad. Thought I at least could see if there were some CYA or not. I use them as a cheap indicator of presence of FC, but I find them...

It seems I've gotten some algae problems for the first time, and could use some help from people with experience. There's a greenish "powder" all over the bottom and lower sides of the pool. It is easy to scrub away, making clouds in the water, and the filter cartridge becomes dark green. When...

Thanks for your replies. I have no reason to believe that increased CH has helped, I lean more towards that the car cooler fluid during winter is doing the trick, plus better water balance in terms of alkalinity and pH now. It is though good to here that CaCl2 at least won´t cause any harm...