quietest return pump

[golf nut]

Originally Posted by sphelps

for example their tolerance is 0.005mm!!

.00019" two tenths of a thou on a skimmer?

[sphelps]

Originally Posted by Mr OM

Perfect

At least somebody understands what is required for a sump return.

If you ask a reputable skimmer mfg they will tell you to use a sump pump of the same value as the skimmers capacity, ie if you purchase a skimmer for a 400 gallon system it performs at its best at 400 gph passing across it, any more and its performance will be depleted. The 10 times turnover rate isn't correct if the tank is skimmed properly.

What's required can be very different from what's best or best for certain people. Also the return rate is independent from the skimmer rate. A sump simply extends the display tank, it's the same as putting a skimmer right in the display besides the effect of the overflow. In fact if anything a higher return would result in more surface water in the sump at all times. I can't see how more or less return flow, compared to skimmer flow, would greatly effect skimmer performance. Unless you have it setup some special way, the skimmer isn't skimming 100% of the water that passes by it, and no matter what the flow rate, the % of water skimmed is the same over a given time frame. The only slight improvement here would actually result from more flow, a higher sump turnover would result in less water being recycled through the skimmer. Like previously stated it's a matter of preference, both low and high flow have there advantages but it's a preference not a requirement. There are obviously limits but the range is large. One more reason I see more being better is matching the flow doesn't actually make sense if you look at the numbers. My skimmer for example flows 4000L/h and it's rated for tanks up to 3000L, hmmm so the "required" flow results in a turn over of 1.3

Food for thought: I design and manufacture load cells and weighing systems yet I personally don't use any of them. If I was looking for advice on anything regarding it's installation and real life performance I'd ask the people using them.

Originally Posted by Mr OM

.00019" two tenths of a thou on a skimmer?

That's what's stated regarding the RD pumps, not sure about the skimmer. Keep in mind it likely referring to components relating to the bearings or shafts but it still demonstrates quality.

[golf nut]

Originally Posted by sphelps

Food for thought: I design and manufacture load cells and weighing systems yet I personally don't use any of them. If I was looking for advice on anything regarding it's installation and real life performance I'd ask the people using them.

Please tell me you are kidding, you design something and sell something that you would ask the end user about because you don't know?

My granny has an Audi, she bought it on their 24 Le mans performance, not because it comes in a nice pearl white shade, they don't ask her to drive it around the track and ask for input.

[sphelps]

Originally Posted by Mr OM

Please tell me you are kidding, you design something and sell something that you would ask the end user about because you don't know?

My granny has an Audi, she bought it on their 24 Le mans performance, not because it comes in a nice pearl white shade, they don't ask her to drive it around the track and ask for input.

Sorry but that's real life, we can do all kinds of tests but they will always be based on laboratory conditions. Most companies and people would call that good enough and act like they know everything. However some companies go the extra mine and provide perks to qualified customers in return for valuable feedback which provides more information for more accurate specifications and further advancement. Also I may design one component for a crane or power plant but I'm no expert on cranes or power plants.

I was only suggesting that the manufacturer isn't always the best source for certain information, I didn't say your grandma was either but I can assure you someone drove that car around the track and it wasn't the manufacturer.

[golf nut]

Originally Posted by sphelps

Also I may design one component for a crane or power plant but I'm no expert on cranes or power plants.

I was only suggesting that the manufacturer isn't always the best source for certain information, I didn't say your grandma was either but I can assure you someone drove that car around the track and it wasn't the manufacturer.

Considering that we typically call the manufacturer if we need information I would hope that they have enough experience, or feedback to reliably answer my questions, yet you choose to ignore their recommendations or at least fluff them off.

I will advise my granny to stay away from cranes and power plants.

[sphelps]

Originally Posted by Mr OM

Considering that we typically call the manufacturer if we need information I would hope that they have enough experience, or feedback to reliably answer my questions, yet you choose to ignore their recommendations or at least fluff them off.

I will advise my granny to stay away from cranes and power plants.

Now you're just being silly, trying to twist words to your liking. First of all it was "food for thought" which means something to think about, but you chose to bring the whole thread off topic in an attempt to find holes in something that doesn't have any. Second that's not what I said at all, but I did say the exact opposite.
Maybe, just maybe a skimmer manufacturer doesn't know what size return pump you should run on your tank, that's all I was saying from the start. After all they don't usually make return pumps or full aquarium systems but rather a single component. Plus it seems some people already disagree with the ratings provided by such manufacturers, so why would you think they would be experts on other components?

Originally Posted by Mr OM

If you ask a reputable skimmer mfg they will tell you to use a sump pump of the same value as the skimmers capacity, ie if you purchase a skimmer for a 400 gallon system it performs at its best at 400 gph passing across it, any more and its performance will be depleted. The 10 times turnover rate isn't correct if the tank is skimmed properly.

Originally Posted by Mr OM

BK will tell you in a heartbeat that you can overdo skimming by buying a unit that is oversize, it simply doesn't work, or should I say doesn't work properly.

[golf nut]

Originally Posted by sphelps

Now you're just being silly, trying to twist words to your liking. First of all it was "food for thought" which means something to think about, but you chose to bring the whole thread off topic in an attempt to find holes in something that doesn't have any. Second that's not what I said at all, but I did say the exact opposite.
Maybe, just maybe a skimmer manufacturer doesn't know what size return pump you should run on your tank, that's all I was saying from the start. After all they don't usually make return pumps or full aquarium systems but rather a single component. Plus it seems some people already disagree with the ratings provided by such manufacturers, so why would you think they would be experts on other components?

The OP requested a quiet return pump, I asked what was the reason for such a large amount of flow(read noisy).and backed up the statement regarding what the skimmer mfg suggested the ideal pump size would be.

Your answer was that the manufacturer was no expert, you continue to push high sump turnover rates and consequently ignore the manufactures suggestions, if the OP used a pump of the correct size he would not have the noise issue he is getting nor an expensive bill to purchase or operate such a large pump as you are suggesting.




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