Yes be very careful as they and chlorine often have vented caps. I put down a bache and tie them down.
According to our Marina tester (with bottles of reagent) the ph is around 7.4 now. The strip tester however shows it is still under 7. I tend to believe the former over the strip.
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Saw some hypochlorite yesterday at 36%, which I hadn’t seen before 
. I use 10% which is plenty strong enough for my 1000 l spa. I add about a dessert spoonful at a time 
. Following the advice of @Corona I’ve been using the liquid chlorine along with chlorine tabs as well for some (but not too much) CYA and that, along with a modest alkalinity of about 60 ppm (mine starts at close to zero) has kept pH very stable at close to 7.4 all summer so far. Good result.
Very wise, over the years I have earned quite a bit by correcting things that others corrected due to stips 
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I’ve used a few strip tests and all have been cr** apart from one I am using now. The free Cl and pH do match my dpd1/ phenol red tests and it seemed to be accurate for TA when I raised it gradually in 15 ppm amounts. Can’t really be too sure about the hardness and stability (CYA I assume) but they do read believable values.
You are just fuelling the bad end of testing. Spend thousands on a pool and €5 on a test strip 
of course it could be your eye sight isnt as good as it used to be because never has the printers ink on the label matched the colours on the strip.
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I bought my replacement pool pump capacitor from this company. I feel able to recommend them.
https://www.condensateur-web.fr/
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Hi Corona/John, Sorry, I’ve just realised I didn’t answer your question about my primary sanitiser. The answer is that the devis that I’m considering from Aqua Creations/Hydrosud from Saintes, would provide salt electrolysis and no UV. I think that should be fine from what I’ve read. I’ve also contacted No-Stress-Pools in Tremblade, so I would welcome any comments good or bad as to experiences with either of these installers, and also the pool installer from St Jean d’Angely that was mentioned in an earlier post. Many thanks, Philip
Just to ask, did you get an S2(P2) type capacitor or an S0(P0) type. I ask as one of the heat pumps on my underfloor heating (there are three !) was damaged because the manufacturer fitted S0(P0) capacitors which have no short/open circuit protection so it set on fire when it failed. They should have fitted S2(P2) capacitors which would have failed gracefully. I changed the other two capacitors immediately.
Useful to know!
If the SO)PO) catches fire, why is it made? Surely your S2(P2) should be the norm…?
The S0(P0) caps are just regular caps. The vast majority of caps don’t have any sort of OC/SC protection. If you look at your cap, somewhere there will be a ‘P0’ (or P1 or P2) printed on it.
So it’s an S0 cap. No protection. It’s not a huge cap though so wouldn’t do a lot of damage if it caught fire. Mine was very much bigger.
Hi Philip, no problem, unfortunately I don’t know any of the company’s you mention as most of those I did know have retired. If you have many questions or want to run the devis past me for anything I may spot or question, no problem at all.
Kind regards
John
@hairbear - what strips are you using?
The ones I bought on Amazon are no longer available.