Would you buy this?

[Wills]

I want a pump to speed up water changes on my 75 gallons and found this. £12 for 5000lph is very cheap! Its a bit bigger than I'd have liked as a unit but overall not bad...

https://bargainfox.com/products/b09...LNA5xHsBoJZk3lbpaklNlix9J1fzjz-xoCU_YQAvD_BwE

I don't know the website though and being cheap the kit worries me but also is it legit?

Wills

 

[GaryE]

It's hard to say. I had one that looked like that, but was a much older version that leaked oil when in use...

 

[Wills]

It's hard to say. I had one that looked like that, but was a much older version that leaked oil when in use...

Hmmm thats interesting...

I found these two

https://www.allpondsolutions.co.uk/products/4500lh?_pos=10&_sid=e48e9ae69&_ss=r
https://www.allpondsolutions.co.uk/...ble-aquarium-pump?_pos=7&_sid=e48e9ae69&_ss=r

All pond solutions is pretty solid in the UK really, the same products are sold in North America under a different name but I can't remember which... It's just if the extra 1000lph is worth it... my maths isnt good enough to work out how fast it would do it!

I want to take out approx 150 litres of water as fast as possible. I've got a 1000 litre per hour pump at the moment but I cant work out how long that would take the 150 litres to get out or how the other two compare? Maths really isnt my strong point!

 

[GaryE]

Fingers and toes here...

 

[WhistlingBadger]

If it's a brand you know and/or a store that backs up their stuff, for twelve pounds? Sure, I'd give it a try. I've used modified internal filter pumps to refill after water changes before. This would probably work a lot better than that.

 

[Essjay]

I want to take out approx 150 litres of water as fast as possible. I've got a 1000 litre per hour pump at the moment but I cant work out how long that would take the 150 litres to get out or how the other two compare?

1000 litres in 60 minutes.
100 litres in 6 minutes.
50 litres in 3 minutes.

150 litres in 6 + 3 = 9 minutes.


5000 litres in 60 minutes.
500 litres in 6 minutes.
100 litres in 1 minute 12 seconds.
50 litres in 36 seconds.

150 litres in 1 min 12 secs + 36 secs = 1 min 48 secs.









[Did I say I got grade 1 O level maths many many years ago. Wanted to do A level maths but maths and biology lessons were held at the same time and biology won]

 

[GaryE]

How long would delivery take if an African swallow carried it, as opposed to a European one? That would be math(s).

 

[Wills]

1000 litres in 60 minutes.
100 litres in 6 minutes.
50 litres in 3 minutes.

150 litres in 6 + 3 = 9 minutes.


5000 litres in 60 minutes.
500 litres in 6 minutes.
100 litres in 1 minute 12 seconds.
50 litres in 36 seconds.

150 litres in 1 min 12 secs + 36 secs = 1 min 48 secs.









[Did I say I got grade 1 O level maths many many years ago. Wanted to do A level maths but maths and biology lessons were held at the same time and biology won]

Hooray! Thankyou for doing this quite obvious when you do it like that haha!

There is a bit of real world addition to it as there is no way its 9 mins at the moment but I suppose the water has to travel down the pipe and into the sink which includes an uphill section, probably closer to 30 mins. I'd guess with a 5000 litre pump in that measure I'd have it down to approx 6 mins then which is really good...

 

[Essjay]

My father, who was very good at maths and sat his school certificate in maths a year early, always said to use shortcuts whenever possible. Like dividing by 10 then by 2 is much simpler than 60/1000 x 150.

 

[TNG]

There is a bit of real world addition to it as there is no way its 9 mins at the moment but I suppose the water has to travel down the pipe and into the sink which includes an uphill section, probably closer to 30 mins. I'd guess with a 5000 litre pump in that measure I'd have it down to approx 6 mins then which is really good...

Many pump manufacturers provide several flow rates for their pumps, because how fast they can pump depend on the difference in height between where the water is pumped from (your fish tank, in this case) and the height of the disposal point (the height of your sink ).
In the image below, the flow rate of pump model RP400 is 3600 litres per hour when the height difference (known as "Head" in the pump industry) is 0.25m, but drops to 400 L / sec when the head is 2.5m

 

[davros]

TNG has it. Based on my experience with asian specs I would say the offered flow rate rate is at zero head and at the max head is barely a dribble. A table like above would be the only way to know for sure.

 

[emeraldking]

Just took a peek at the link. It's really cheap. And it does show the original price as well. I would give it a try but I would also be a bit suspicious why it's offered for such a low price. But when it comes to the price, it will be worth it to try it. And if it turns out to be failure, you haven't wasted too much money on it.

 

[TwoTankAmin]

Pool pumps tend to be oil filled and I would avoid those.

Head is for when raising water, When using a pump to e,pty a tank it is the reverse. The water is usually flowing down hill, so the flow rate should not be diminished from maximum capacity.

I use several pumps for both emptying and refilling. The pumps used for refilling have a higher flow rate than what I use for emptying.

One word of caution- when we empty a tank manually, we are usually staying right there until it is finished. However, when we use oumps we end up just watching the water flow one way or the other. I hate doing nothing and tend to try doing other tanks tasks while the tank is refilling. The result, over the years, has been I occasionally take out 50 gallons and I put back 60. The last 10 are usually spread evenly across the floor.

I have been using pumps for many years and I still manage to move more water than I should have. For this reason I have a huge pile of old towels and bathmats on hand. I am less concerned with speed an more concereed with head for refilling but, most of all, reliability. For refilling I use either a fan sprinkler type head or else the handy green device from Python (best for deeper tanks).

All of my hoses and pumps have garden hose type connections.

Re choosing equipment--> reliability is much more important than cheap. In the long run, the cheapest solution is usually one that costs the most up front. The best air pumps I have cost me between $80 and $100. The prices have gone up since I got them. The two smaller models handles 8 -12 outlets and the bigger one 12-20. I have had then for a number of years and they run great and the big one powers six pleco tanks with multiple cube filters and a few Mattenfilters.

 

[WhistlingBadger]

This has nothing to do with the topic, but I enjoy how British people say "maths," plural. It sounds funny to American ears. In the USA it's "math," a mass noun, like water or pudding or substrate. Just one of those funny little differences.

 

[Essjay]

In the UK, math sounds funny as the full word ends in s