Recent content by AusJohn

There is a little bit to learn, but the system suggested here works and you can pick it up pretty quickly especially when there are some very competent people here to answer pretty much any question you ask. Don't let it scare you, you will get the hang of it easily enough. Just go on the way...

Foaming is typically caused by reduced surface tension in the water. Just about anything that you add to the water reduces surface tension. Pure water has the highest surface tension. All dissolved salts reduce surface tension as the ions get between the water molecules at the air water...

I think there's a few factors here that would impact whether you can do the job properly and still make money. Firstly, I agree, they would need to have some sort of chlorine dosing system and the pucks are not ideal. There probably is scope to do a contract though where they agree to retain...

Hi b_veselka, I'm guessing that you're not using the magnetic stirrer for your test so you can expect that it will take a little time for the reagent to mix evenly through the sample. You are quite right, you are looking for the whole sample to turn blue after it is all mixed through. You will...

If you track how much your FC is dropping per day, that will help to give you an idea of where to set your SWCG. Hayward don't seem to publish a chlorine output for their generators, but if you measure your FC after dark, then run the SWCG on 100% for a couple of hours then turn it off and keep...

Sorry I didn't actually answer your question. You could reuse it, particularly if the filter wasn't very dirty, but as the hydroxide is consumed in the cleaning process, I probably wouldn't bother. If it's dirty enough to need cleaning, it will consume most of the available alkali in the...

Most of the time when you clean your filters, you are actually degreasing them to get rid of all the skin oil, sunscreen and any plant oils that may end up in the pool from fallen flowers, seeds or foliage. The product in the pouch is probably soda ash or possibly a mixture of soda ash, caustic...

The CYA test is quite subjective, it's variable with temperature and lighting and the operators visual acuity. If you're in doubt, I'm sure Taylors do a CYA standard solution that you can test first so you can see what it really should look like under the lighting conditions you have. It does...

That's good, I've had two sets of reagents from them for CYA and have never hit a result of greater than 30. Thing is I just refilled the pool before getting the kit, know exactly how much stabiliser I added and the photometer test matched within a few ppm. Not only that but some back of the...

Also check the salt concentration. Heavy rain will dilute the pool and if it overflows you will lose salt. The SWG can't make chlorine without it.

Hi Squibcakes, Are you in the part of QLD that's been getting the sort of rain that drowns you if you look up ? Has the pool been overflowing or had a lot of debris washed in? If not, the pool going green with those numbers would indicate that there may be an issue with the test. Since you're...

I'm glad it got resolved, yes alum would work reasonably well, not down to the level that you will get to with the lanthanum, but way cheaper to remove the bulk of it with alum when you have high levels. My pool gets a lot of debris in it from palms and tree ferns. So phosphate can sneak in...

Hi Swampwoman, I have come into this thread very late, I haven't read it all the way through. I just wasn't sure if you had found a resolution to your analytical problems but have a couple of comments. Based on your readings in your testing going back around the middle of the thread, you had...

People do get some strange ideas in their heads about chemistry. For anyone after a chuckle, I would suggest visiting Dihydrogen Monoxide Research Division - dihydrogen monoxide info, enjoy. :)

So I got a quote back for the Equilibrium unit and it's not exactly cheap. The documentation doesn't list any specs on the pH measurement system although you can see from the pics in the manual that the resolution is 0.1 pH unit. I've had a look at most of the other options around using pH...