OC-1 Filter Media in a Domestic Swimming Pool

The Verdict

 

 
Pool size 15 mtr X 4.5 mtr Pool shape Rectangular with Roman steps
Pool type Delifol vinyl liner UK Situation Inground
Capacity 50 cu mtrs Use Occasional seasonal domestic
Pump Certikin Swimflo HPS031M Flow rate at 10 mtr head 8 cu mtr hr
Filter Certikin ZZOC-1/20 Filter Diameter 20"

2021:

The Verdict - Would I Recommend OC-1?

The crux of the matter is am I happy with and would I advise others to use OC-1? Bear in mind that I have invested time and money in the filter and media, so naturally I want them to be a success.

I think that from the point of evaluating filter media capabilities, we can forget 2020. Undoubtedly progress was made with the manual clearing of the debris on the floor at the deep end, and the removal of the black gunge from the walls and bottom in early 2021. This action has made the greatest effect on water quality. Hopefully others will not be starting from there. I cannot recommend a deep leaf net too highly, I'm going to get another as a spare. Sanitising and balancing the water (I have only used chlorine and pH-) also provides a sound base.

If the filtration quality of OC-1 proves to be at least as good as sand, then yes, I would recommend it (with a few caveats) as it does have advantages over sand in other areas. If the filtration were anywhere near the one micron claimed, then I would recommend OC-1 very highly indeed. But I'm not there yet. The large slots in the top and bottom laterals, and the open nature of the OC-1, appear to enable much of the water to flow straight through the filter media untouched. I believe that this is why the filtering process seems to be slower than sand, which offers a much denser barrier to water flow. It's a slow process and I am still waiting to get to one micron clarity, but I can see improvement little by little, if not quite daily.

I would install the specialist ZZOC-1 filter. The water distribution with top laterals will always be better than a top dispersion adaptor. I would also try to reduce the flow through the filter (it will inevitably be a reduction) to as close to Certikin's recommendation, which in my case with the 20" filter is 5 m³/hr, as possible.

The benefits of OC-1 are, as I see them:

1) It will never, ever find its way into the pool
2) Backwashing is less frequent
3) Its open structure lowers resistance to flow
4) It requires no more maintenance than sand
5) It allegedly filters to one micron
6) It can't cake or clog or channel
7) It's light and easy to handle

The cons are few so far:

1) It seems to be slower to reach maximum filtering capability
2) Getting the correct flow though the filter may be difficult
3) Hazy water may be a problem in some cases
4) Nobody, especially in the pool business, knows anything about it, or if they do they look upon you as a crank

I can live with most of these. I believe that OC-1 needs a little more knowledge and control, and needs a closer adherance to flow rate and other parameters. By mid 2021, after some tribulations peculiar to my pool, I consider that OC-1 has reached comparison with sand in filtering quality, but I await the day when I need sunglasses to protect my eyes from the scintillating pool water.

I would not recommend OC-1 to anyone who is not, for whatever reason, able to spend some time and effort in setting up and managing their pool filtering system. For those who like a bit of a challenge then OC-1 is well worth considering.

 

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