Pool Tips

After a heavy rainfall, your swimming pool may go brown from surrounding garden sand being washed into the pool. This could take days to clear by running the water through the sand filter. Sometimes the sand filter clogs up within hours, and the circulation is then so poor, that the pool remains dirty.

A quick-fix to this problem is to flocculate (cause the dirt to form clumps and settle at the bottom of) the pool.


Use about 2kg’s of alum powder per 50kl of pool water. Always add alum to the pool with the filter set to ‘circulate’ so the alum bypasses the filter sand.

Once the alum is mixed in with the pool water (1 – 2 hours), switch the pump off. As the alum starts to settle, so does the rest of the dirt in the swimming pool. This usually solves the problem 1st time round.

When all the dirt has settled on the floor (approximately 24 hours later), be sure to vacuum it to waste (not through the filter) as the filter will clog up within minutes, and will most likely blow the dirt back into the pool, leaving you at square one!

Make sure the swimming pool is topped up to the brim before starting to vacuum, or you could run out of water half way through the process.


One of the most asked questions by prospective pool owners is: "Which is better, fibreglass or gunite (concrete)?" If the customer asks this question in front of enough pool 'professionals', they'll get a barrage of answers, all different, for a number of reasons.

If you ask a pool salesman who sells fibreglass shells: which type of pool is better, he'll swear that the best thing you can do is invest in a fibreglass shell pool. If you ask a pool builder who builds gunite pools: which is the best swimming pool to buy, he'll tell you a load of horror stories about how fibreglass pools have crumbled, cracked and popped out of the ground. He'll tell you how once you've installed the pool and the fibreglass gelcote starts to blister, you will never get the pool company back to sort out the product failure.

If you had to ask an expert in the field of the built environment, architects or engineers, I'm sure they'll say build a gunite pool, for sure! These experts would insist on making sure that the specifications are in line with those of the NSPI's (National Spa and Pool Institute). Use the correct size steel at the correct centres...etc. The key word being, NSPI. This is not to say that NSPI registered builders never make mistakes or have problems with their swimming pools, but they certainly have a vested interest in making sure that their reputation remains in tact.

If there was to be a correct answer to the question: "Which is better, a Fibreglass pool or a gunite (concrete) pool?" The winning answer would be, a swimming pool built by a registered member of the National Spa and Pool Institute of South Africa. If their name is not on the site, then they are not members.

Pool Water Testing

There are certain guidelines we should follow when maintaining our swimming pool. For the health of bathers, we should be testing our pool water at least once a week. Especially during the busy, hot and rainy summer periods. In South Africa’s Durban KwaZulu Natal, anyway.

Keep the chlorine residual between 1 & 3 parts per million (ppm). This keeps the water sanitised. Keep the pH between 7.2 & 7.6. This is the optimum pH for bather comfort and sanitizer efficiency. These are the basic tests every pool owner should do each week.

It could be that your test results are ideal (chlorine and pH) but your pool water is green or murky. This means there are other factors such as poor filtration, circulation or water balance causing the problem. The first step is to take a sample of water to a specialist pool shop that can test for chloramines, Total Alkalinity, Stabilizer, and TDS. If the pool shop is an NSPI member, then you should be in good hands. Once the water balance is corrected, if the problem persists, you may need to get a technician to call on your pool and assess what other problems may exist.

BLUPOOL swimming pool services in Durban North are authorised BioGuard® dealers and can help with most swimming pool problems. Pool leaks, resurfacing of swimming pools, pump and filter repairs and pool surround paving are some of the other services BLUPOOL offer, as well as building new swimming pools.

Back-Up® Algaecide is a unique form of liquid concentrate available in 500ml bottles. Pool chemicals work better when the water is properly balanced, and even though Back-Up® works in high or low pH conditions, your water will still need to be balanced in order for chlorine to work effectively.

When using Back-Up®, an initial dose of 90ml per 10, 000L of pool water is required, and then a maintenance dose of 15ml per 10, 000L per week is all you need to keep the algae at bay.

Weather conditions in South Africa, and particularly in Durban, Kwa-Zulu Natal, keep pool owners on their toes. Looking after the pool's water balance and taking precautions during the weekly maintenance routine, will save a lot of time and money.
Some benefits of Back-Up®:
• Won’t evaporate
• Won’t stain surfaces
• It’s a broad spectrum algaecide
• Can also kill Pink Algae (ask your BioGuard Dealer for instructions)

back up algaecide

Have fun in your swimming pool this summer. Keep your pool water balanced.