Logitech Z-4 2.1 Computer Speakers Controller and Subwoofer - GBP 20
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By David Peckham · Posted
Word on the street is that somebody overcompensated for the 'Gritty Steps' debacle. Expect heads to roll. Nuff said. -
Sign the petition against the ED Post office closure! https://chng.it/FdH5DhSy4H -
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According to https://www.compass-pools.co.uk/learning-centre/news/the-complete-guide-to-swimming-pool-maintenance/: ... "Your weekly tasks should include: ... Checking the pH levels and adjusting the water balance ... The ideal pH rating of swimming pool water is between 7.0 and 7.6. Anything lower than 7.0 and metals and pool finishes can start to corrode, while anything above 7.8 and there can be issues with scaling due to calcium salts in the water and chlorine becoming ineffective." And for comparison of different pH values, see for example the examples chart at https://www.bbc.co.uk/bitesize/articles/z38bbqt#zb2kkty There are several other sites that can easily be found that say something about variation and correction of pool pH levels.
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