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samples for the ongoing tests. An important point to note is that for the flocculent to work at its optimum the water temperature ideally be over 20°C to ensure effective results. It should also be understood that flocculation and the improvement of turbidity levels is not instant and usually takes a day or two to reach optimum levels, so it was arranged that the pool turbidity levels would be monitored and recorded on a daily basis.


MSI’S JOLLY GEL flocculant removes problem pool water particles.


During the summer of 2019, I arranged


for some flocculent tests to be carried out on two identical test pools. For the tests it was decided to trial a very popular flocculent used for swimming pool filtration, namely MSI’s Jolly Gel which acts in a physical way facilitating the removal of particles by filtration. This product has now been on the market for 28 years and is widely available in the UK the Middle and Far East as well as Europe.


TEST POOLS The two test pools that were chosen


to be used for the test were at a research centre in Sussex and both were liner pools identical in size and shape, outdoor and open to air. They were also right next to each other so that they would both be subjected to the same conditions particularly air borne pollution. At the start of the exercise, the first


test pool No; 004 appeared visually good and the second pool No; 005 appeared visually cloudy. To ensure our test results were absolutely accurate we gratefully received assistance from Tintometer Ltd who loaned us a brand new ‘state of the art’ Turbidity meter. As with most things in life preparation


is always key to producing an accurate final result. In this test it was important to measure the pH and chlorine levels at different areas around the test pools, as if they were not properly controlled they could adversely affect the results. We then took turbidity test samples


from several areas around the pool, and it became evident that the highest turbidity readings were from the deepest part of the pool, so it was agreed that this would be the best place to take


TURBIDITY Those result were then submitted to


me for consideration and analysis. The turbidity testing took place over a five day period and the results were quite impressive as you will see from the graph shown. Whilst test pool No 004 started out looking visually good with a turbidity reading of 0.4NTU (being 0.1 NTU below the PWTAG Standard), even so Jolly Gel managed to improve the water clarity by taking the level down to: 0.27NTU which is well below the 0.5NTU standard set by the PWTAG. Perhaps even more impressive was the results for pool No 005, as this pool was


“IN THE ‘GOOD OLD DAYS’ WE’D DO THE COIN TEST; BY SEEING IF WE COULD SEE THE QUEEN’S HEAD ON AN OLD PENNY THROWN IN


AT THE DEEP END” - Chris Carr


initially in a very poor condition with a turbidity reading of: 1.28 NTU. After just four days the turbidity level in this pool was reduce to 0.28NTU and although there was a slight rise at the end of 5 days it was still within the 0.5NTU Standard set by the PWTAG. In fact If you take the standard of 0.5 NTU


and rate it at 100% then the best results from the two pools was almost 50% better than the set standard.


Mineral Supplies International Tel. 01825 790524 www.mineralsi.com


IF WATER TURBIDITY IS OUTSIDE THE STANDARD set by the PWTAG then a suitable flocculent is one of the most practical ways to resolve the problem.


THE POOL WATER TREATMENT ADVISORY GROUP set the standard for swimming pool water in the UK.


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