HTC Posted July 25, 2019 Share Posted July 25, 2019 I have been quoted for the following parts for my pool which has approx 30m3 water. I calculate a required flow rate for sanitation of 3.75m3/h if I plan to run the pump for 8 hours a day. Pump: Astral Alaska Plus 1.0Hp (flow of 18m3/h) Sand Filter: Emaux MFV20 (20") Top Mount (flow of 10m3/h) UV: Emaux NT-UV40-T (flow of 20m3/h) or Astral Helios UV LP PE (flow of 10m3/h) PH Control: Exactus feed system (5m3/h) CL Control: Exactus feed system (5m3/h) I'm worried about the pump being too strong at 18m3/h when the sand filter is only 10m3/h and chemical control systems at 5m3/h. What do you guys think? Link to comment Share on other sites More sharing options...
grollies Posted July 25, 2019 Share Posted July 25, 2019 8 hours ago, HTC said: I'm worried about the pump being too strong at 18m3/h when the sand filter is only 10m3/h and chemical control systems at 5m3/h. yep Link to comment Share on other sites More sharing options...
HTC Posted July 26, 2019 Author Share Posted July 26, 2019 So how much more flow should the filter have compared to the pump?Looking at system diagrams the auto-dosers don't actually sit inline with the main pipes, so am I correct in thinking that the flow rate of them isn't so important? Link to comment Share on other sites More sharing options...
Valentine Posted July 26, 2019 Share Posted July 26, 2019 3 hours ago, HTC said: So how much more flow should the filter have compared to the pump? Looking at system diagrams the auto-dosers don't actually sit inline with the main pipes, so am I correct in thinking that the flow rate of them isn't so important? Should be able to tee off the auto dosing systems from the main return line & insert valves so you can regulate a lower flow through them Link to comment Share on other sites More sharing options...
grollies Posted July 27, 2019 Share Posted July 27, 2019 On 7/25/2019 at 10:09 AM, HTC said: I have been quoted for the following parts for my pool which has approx 30m3 water. I calculate a required flow rate for sanitation of 3.75m3/h if I plan to run the pump for 8 hours a day. Pump: Astral Alaska Plus 1.0Hp (flow of 18m3/h) Sand Filter: Emaux MFV20 (20") Top Mount (flow of 10m3/h) UV: Emaux NT-UV40-T (flow of 20m3/h) or Astral Helios UV LP PE (flow of 10m3/h) PH Control: Exactus feed system (5m3/h) CL Control: Exactus feed system (5m3/h) I'm worried about the pump being too strong at 18m3/h when the sand filter is only 10m3/h and chemical control systems at 5m3/h. What do you guys think? You should be looking to turnover your total pool volume a minimum of once per day. So for 30m3 in 8 hours you'd need a pump capacity of 3.75m3/hr. Add say 25% for flow loss through filter, pipe, valves and fittings you should get a pump with a flow of around 5m3/hr. It then falls into line with your other equipment. Plus a lower electric bill. Link to comment Share on other sites More sharing options...
alacrity Posted July 27, 2019 Share Posted July 27, 2019 If you restrict flow, the pressure increases before the restriction. So, the operating pressure of your pump and filter comes into play. Post filter would be o.k. Link to comment Share on other sites More sharing options...
HTC Posted July 27, 2019 Author Share Posted July 27, 2019 9 hours ago, grollies said: You should be looking to turnover your total pool volume a minimum of once per day. So for 30m3 in 8 hours you'd need a pump capacity of 3.75m3/hr. Add say 25% for flow loss through filter, pipe, valves and fittings you should get a pump with a flow of around 5m3/hr. It then falls into line with your other equipment. Plus a lower electric bill. So with a 25% increase that brings the required capacity to around 4.7m3/hr. So this small 0.5hp pump with a flow of 10.4m3/hr should be more than enough? https://www.winwinpoolshop.com/en/product/24696/alaska-plus-05-hp1ph-220-v- I can't see pumps with a lower flow. Link to comment Share on other sites More sharing options...
HTC Posted July 28, 2019 Author Share Posted July 28, 2019 If the flow rate of the pump is higher, would that mean the water circulates quicker meaning a turnover of more than once per day?As long as the other parts don't cause a restriction, that should be okay? Link to comment Share on other sites More sharing options...
grollies Posted July 28, 2019 Share Posted July 28, 2019 22 hours ago, HTC said: If the flow rate of the pump is higher, would that mean the water circulates quicker meaning a turnover of more than once per day? As long as the other parts don't cause a restriction, that should be okay? Yeah, there's a need for practicality in all things. 10m3/hr pump should be ok for the filter and UV kit. Re the pH and CL controllers that amount of flow won't affect them mechanically (as it would have for 18m3/hr going through a 10m3/hr sand filter), it's just they will only be able to treat 50% of the water flow (at 10m3/hr). You are right as well, the more turnover per day the better. Link to comment Share on other sites More sharing options...
.thumb.jpg.8d1a71394325b508272291755f4e1850.jpg)
Recommended Posts
Archived
This topic is now archived and is closed to further replies.