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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...

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...

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...

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...

I have seen on the safety sheets of common swedish brands of bleach that they often contain "kaliumsilikat" or "natriummetasilikat" (don´t know the english term, but I think it is also commonly used in washing powder). What effect do you think this could have in a pool?

Common advice in Sweden regarding alkalinity and calcium hardness is: Alkalinity somewhere between 60 and 125 Calcium hardness somewhere between 100 and 400, but always higher than the alkalinity. Just out of curiosity, what could be the reason for the advice to keep calciumhardness higher than...

Hi, This is my first post in this wonderful forum. I am interested in pool chemistry, and I have learned a lot from all the experts on this forum. I live in Sweden, and the common pool advice in Sweden sometimes differs a bit from your advice here. I have a few questions related to this, here is...

Hi, Found this forum a few months ago, and with all the experts on this forum I couldn´t resist registrering any longer! I have a small Intex pool now, maybe will upgrade later. Main interest right know is pool chemistry (oh no, another geek?? :lol: ), although my knowledge is nowhere near...