What size of sand filter?

[Mrh74]

I've been trying to work out what size sand filter I would need to buy for my Christal Pool 5:5/60, it has a water volume of 53000 Ltrs or 11300 gallons and a pump that moves about 15 - 17 cubic meters per hour (if my calculations are correct). I've tried to find a filter to fit but I'm baffled and the information I can find on the web doesn't really help much , any help/advice greatly appreciated.

Cheers
Mark

[Jonzjob]

What type of filter do you have at the moment?

[Mrh74]

Currently it's got the filters supplied with the kit, which are 2 cartridge filters, these work well, but are a bit of a pest to clean and looking at spares not cheap about 150 euro a pair, so I figure a sand filter with zelbrite in it will do a similar quality job of filtering and be easier for my chap who looks after the place to clean with a quick backwash. I just can't work out what size filter I'm going to need.

Cheers
Mark

[Jonzjob]

According to Poolguy and I tend to agree.. You will need a filter rate that will filter all the water in your pool in 3 to 4 hours. When you start looking for filters they should tell you the flow rate, possibly in cubic metres/hour. That's how mine shows it. If it shows it in litres/hour there are 1000 litres per cu metre. Sory if this is teaching egg sucking?

One of the next things that I have to do is to replace our pump. 2 reasons, 1  it's  very old and 2  it's only 3/4 horse and it should really be 1 horse.

I've not had anything to do with cartridge filters, but I have heard that they are fiddly and expensive compaired ot sand. The zeolite (Zelbright) will probably cost about the same as a couple of filters, but you have that for a long time... Ours works well.

[Poolguy]

Thanks again John for your help.

Mark

For a 5:5/60 I recommend a 22m3 per hr with a min of 1.5 cv pump and 150kg or ZelEau. Thats 2.8 hr ciculation - Good.

That will give you a really good clean and your water will be easy to manage.

You can build this local technique up uniquely or there is a Boxed version which come ready assembled and you just 'plug it in'

PM me if you want more details.

Andrew

[Smiley]

I'd just like to say thank you to Poolguy for his consistent and valuable contribution to this forum. I find his postings valuable information even when I haven't asked the question. Please keep it up, this is what the forum should be about.

Many thanks.

[Mrh74]

Thanks for the replies and sorry I've been a while in saying that, but I've been stuck on work things!

Anyway, I have a brand new pump that came with the kit and don't really want to replace that with a larger one right now, it's a BADU TOP 14 which if I've worked it out right delivers somewhere between 3/4 and 1 HP, it's rated as 0.65 kW. Would this run a filter capable of 22 m3 per hour or would it not have sufficient pressure to do it?

Cheers
Mark

[Poolguy]

Mark

No..... a 3/4cv pump will not utilize the capacity of a 22m3/hr filter

and it will never get up to pressure (1 bar). Your pump will struggel

to output 14 m3/hr with zero head of pressure. I suggest that you

change it for a larger one, I suggest 1,5 cv which should output

between 18 and 25 m3/hr depending on the brand.

If you need help then PM me

Andrew