Fre­quently Asked Questions

Here you will find answers to the most com­monly asked ques­tions regard­ing pump tech­no­lo­gies and solu­tions. If you can't find the answer to your ques­tion, please feel free to con­tact us dir­ectly and we'll be more than happy to help.


What are the main­ten­ance require­ments of the BADU pumps?

BADU pumps are gen­er­ally main­ten­ance free. In order to guar­an­tee a con­stant flow rate and suf­fi­cient fil­ter­ing of the pool water, the strain­er bas­ket must be cleaned at reg­u­lar inter­vals. From time to time you may also carry out a visu­al inspection.



How should I store my counter swim unit over the winter season?

Counter swim units installed in out­door pools should be pro­tec­ted against frost over the winter sea­son. Lower the water level in the pool to the bot­tom edge of the inlet con­nec­tion. Dis­as­semble the pump from the unit and store this in a dry room. Leave the valves half open so that the space in between can be drained.



How should I store my swim­ming pool pump over the winter season?

It's simple: drain the pump and store it in a dry place, pro­tec­ted against frost. Cov­er it with a dust sheet.



How should I store my sol­ar pan­el unit over the winter season?

At the end of the bathing sea­son the sol­ar pan­el unit must be com­pletely drained in order to avoid frost dam­age. In addi­tion, for sol­ar pan­els on flat roofs or roofs with a decline of up to 30°, con­nect­ing sock­ets must be opened and the plates indi­vidu­ally raised until they are com­pletely drained.



How does the back­wash func­tion in the sand fil­ter unit work?

The water from swim­ming pools is mainly cleaned using sand fil­ters. These must be reg­u­larly back­washed in order to loosen up the sand bed and drain off the impur­it­ies that have been filtered into it. Fil­ter back­wash units assume the vari­ous oper­at­ing func­tions of the 6-way valve, which must be set by hand. How­ever our elec­tron­ic back­wash valves from the BADU Tron­ic series can take over this task fully auto­mat­ic­ally provid­ing a simple and con­veni­ent alternative.



Are the BADU products certified?

SPECK Pumpen exam­ine all of their products reg­u­larly and have them addi­tion­ally tested by inde­pend­ent bod­ies. The high safety and qual­ity stand­ards are con­firmed by vari­ous up to date exam­in­a­tion and cer­ti­fic­a­tion stamps. There­fore the most mod­ern tech­no­logy, stand­ards and cer­ti­fied safety spe­cific­a­tions are stand­ard for BADU products. You will find CE, GS and oth­er stamps on BADU products. We will be happy to provide you with more detailed inform­a­tion regard­ing these offi­cial seals.



Should the pump be turned off when the 6-way valve is being switched over manually?

We recom­mend turn­ing the pump off in order to avoid a surge in the unit and for ease of handling.



How should the pump be star­ted fol­low­ing a long peri­od of disuse?

Before turn­ing the pump on after a long peri­od of dis­use (e.g. winter), check to make sure that it can be moved eas­ily. To do this, rotate the motor shaft lightly with the help of a screw­driver. Should the motor stick at all, this will loosen it. Should the pump still remain tight or an unusu­al noise become aud­ible, have the pump examined by a trained professional.



How do I determ­ine what the cor­rect type of pump and device is?

Every product has its own clas­si­fic­a­tion. This can gen­er­ally be found on the name plate on the pump hous­ing. The name plate con­tains all import­ant information.



Where can I buy SPECK Pumpen’s BADU products?

We strongly recom­mend the pur­chase and install­a­tion of BADU products from the premi­um range via our spe­cial­ist retail­ers. Only then can your pump be installed pro­fes­sion­ally and accord­ing to the recog­nised rules of tech­no­logy. Here you will find retail­ers in Europe and world­wide.



What are wear and tear parts?

Wear and tear parts are those ele­ments which seal and rotate e.g. mech­an­ic­al seals, o-rings, gas­kets, the impeller and ball bear­ings. These wear and tear parts are not covered under warranty.



What is a mech­an­ic­al seal?

The leak-proof area of the mech­an­ic­al seal con­sists of two sur­face-ground adher­ents, low-wear sur­faces, (for example rings made of car­bon sili­cide or rather coal), which are com­pressed by axi­al power. The rotat­ing seal ring (dynam­ic) rotates with the shaft, while the sta­tion­ary seal ring (stat­ic) is set up in the hous­ing. A thin film of water builds up between the slid­ing sur­faces, which serves to lub­ric­ate and cool. Run­ning dry causes imme­di­ate dam­age. In addi­tion, o-rings made from vari­ous elast­omers are used as gaskets.



How do I change the mech­an­ic­al seal?

Repairs should only be car­ried out by trained professionals!



What can cause a mech­an­ic­al seal to break?

The mech­an­ic­al seal con­sists of vari­ous wear and tear ele­ments. They seal the pump between the hous­ing and motor and con­sequently pre­vent water leak­ing out in the dir­ec­tion of the motor. It’s nor­mal for a few drops of water to escape from time to time, espe­cially dur­ing the run­ning-in peri­od. If the water con­tin­ues to leak, the mech­an­ic­al seal is broken.



What is a stuff­ing box/gland packing?

Mater­i­als for stuff­ing boxes are for example high value syn­thet­ic threads such as Kevlar® or Twaron®, PTFE, threads made from expan­ded graph­ite, syn­thet­ic min­er­al fibre threads as well as nat­ur­al fibre net­ting such as hemp, cot­ton or cam­bric grass fibre. The mater­i­al for the gland pack­ing is avail­able by the meter or as com­pres­sion moul­ded rings in dry format or sup­plied with vacu­um-pres­sure impreg­na­tion veri­fied with the inten­ded pur­pose. For goods sup­plied by the meter, a ring will first of all be cut and formed. Then the fol­low­er is assembled around the pump shaft and com­pressed with the help of the gland.



Why must a self-prim­ing pump first be filled with water?

A self-prim­ing pump must have a suf­fi­cient amount of water in the pump hous­ing. Only then can air con­tent be trans­por­ted in the suc­tion line. There­fore it is neces­sary to fill your BADU pump up to the inlet con­nec­tion with water. Fail­ing this, the pump may be dam­aged by dry run­ning. Fur­ther­more you shouldn't inter­rupt the suc­tion pro­cess by con­tinu­ally turn­ing the pump off and on, as the pro­cess will have to restart as a result.



What is a self-prim­ing pump?

A self-prim­ing pump has the abil­ity to handle air and gas con­tent and can aer­ate the suc­tion line inde­pend­ently (evac­u­ate air). Dur­ing the ini­tial start-up, the pump must first be filled.



How does a suc­tion line have to be installed?

The air in a suc­tion line col­lects at the "rel­at­ively highest“ point. A non-self-prim­ing pump is not able to intake water over a „hill“. There­fore suc­tion lines are always installed rising stead­ily towards the pump so that it can­not form air pockets.

Tips for the suc­tion lines:

> Suc­tion lines are at least the nom­in­al dia­met­er of the pump’s inlet adapters, when pos­sible install a lar­ger nom­in­al diameter.
> Keep the suc­tion line as short as pos­sible, long suc­tion lines have increased fric­tion­al res­ist­ance, which greatly com­prom­ises the suc­tion lift.
> The suc­tion line should be installed rising stead­ily towards the pump.
> Leak­ages should be avoided at any cost (they dam­age the pump and cause oper­a­tion­al disorder).
> Use curved parts (don’t use brackets).
> Cross overs on the suc­tion side should be installed off centre where possible.
> Plan for a foot valve (strain­er and check valve) on the end of the suc­tion line.



How high can a pump prime?

The max­im­um suc­tion height is the­or­et­ic­ally 10.33 m - this depends on air pres­sure (1033 hPa=normal). Tech­nic­ally a max­im­um suc­tion height of approx­im­ately 7 to 8 m can be gained. Res­ist­ance loss in the pump, con­nect­ing lines and fix­tures must be deduc­ted. Medi­um depend­ent factors (e.g. vapour pres­sure, dens­ity or vis­cos­ity), may reduce the suc­tion height further.



What does the term cavit­a­tion mean?

If the stat­ic pres­sure drops to the vapour pres­sure of the liquid, the decreas­ing pres­sure in a flow­ing liquid (for example through pipe fric­tion res­ist­ance, changes in the abso­lute speed and the geo­det­ic head) leads to the build-up of vapour bubbles inside the liquid. The vapour bubbles will be swept along by the cur­rent and fall apart abruptly when the stat­ic pres­sure rises above the vapour pres­sure again through the increase of pres­sure in the pump on the flow path. This pro­cess is called cavit­a­tion. The vapour bubbles fall apart with the build-up of micro rays which, when they impact on the sur­face of the wall, lead to per­for­ated mater­i­al dam­age. To avoid cavit­a­tion, pay atten­tion to the cor­rect pres­sure maintenance.

Should the suc­tion head, also known as stat­ic pres­sure, provided in the unit fall below the intake height required for the pump, a bal­ance must be estab­lished using appro­pri­ate meas­ures. Ways to achieve this are:

> Increas­ing the stat­ic pres­sure (install the pump lower down)
> Redu­cing the medi­um tem­per­at­ure (reduce the vapour pres­sure pD)
> Redu­cing the loss of fric­tion and cur­rent in the suc­tion line/feed line
> Select a pump with less net pos­it­ive suc­tion head (NPSH) (as a rule: lar­ger pumps)



What do the dif­fer­ent Ingress Pro­tec­tion rat­ings mean?

The two digits with the abbre­vi­ation IP indic­ate the pro­tec­tion rat­ing a product has been giv­en. The fol­low­ing table shows the mean­ings of each rat­ing. If one of the two fig­ures does not have to be indic­ated, it will be replaced by the let­ter X (for example “IPX1”).

The let­ters IP stand for the type of pro­tec­tion and xx is replaced as follows:

1st place: pro­tec­tion against sol­id objects
2nd place: pro­tec­tion against water

1st digit for pro­tec­tion against sol­id objects:


No spe­cial protection


Pro­tec­ted against sol­id objects over 50 mm, e.g. acci­dent­al touch by a person’s hands.


Pro­tec­ted against sol­id objects over 12 mm, e.g. person's fingers.


Pro­tec­ted against sol­id objects over 2.5 mm (tools and wires).


Pro­tec­ted against sol­id objects over 1 mm (tools, wires and small wires).


Pro­tec­ted against dust lim­ited ingress (no harm­ful deposit).


Totally pro­tec­ted against dust.


2nd digit for pro­tec­tion against water:


No spe­cial protection


Pro­tec­ted against ver­tic­ally fall­ing drops of water e.g. condensation.


Pro­tec­ted against dir­ect sprays of water up to 15o from the vertical.


Pro­tec­ted against dir­ect sprays of water up to 60o from the vertical.


Pro­tec­ted against water sprayed from all directions.


Pro­tec­ted against low pres­sure jets of water from all directions.


Pro­tec­ted against tem­por­ary flood­ing of water, e.g. for use on ship decks.


Pro­tec­ted against the effect of immersion.


Pro­tec­ted against long peri­ods of immer­sion under pressure.


Pro­tec­ted against water sprayed from all dir­ec­tions, also against high pres­sure against the hous­ing ( 80-100 bar).




Where could flow noise in a closed heat­ing sys­tem come from? 

Flow noises have dif­fer­ent causes. Tur­bu­lence and fric­tion of the flow meter on the sur­face of the flow­ing parts cause a noise which is per­ceived as hiss­ing. Moreover fric­tion sequences cause an uneven speed dis­tri­bu­tion in the water­proof strat­um, which can lead to a chan­ging flow sep­ar­a­tion with suc­ceed­ing ver­teb­ra­tion. By slow­ing down the flow speed (lower pump­ing rota­tion speed or a smal­ler pump), the noise is decreased or com­pletely avoided. Anoth­er wave of noise is air, which enters the sys­tem because the pres­sure is too low.



When it comes to heat­ing pumps, why is the height of a house not the same as the deliv­ery height?

The res­ist­ance of the pipeline net­work in a closed unit is cru­cial in determ­in­ing the dynam­ic head of a heat­er cir­cu­la­tion pump. This comes from the sum of the res­ist­ance, for example fix­tures, the length of the pipe, curved parts etc. The height of the house is identic­al in the flow pipe and return pipe and can­cels itself out in a closed circuit.



Why are dirt traps import­ant in heat­ing units?

A dirt trap holds back dirt and rust particles in the heat­ing water. Not clean­ing the heat­ing water fol­low­ing the ini­tial oper­a­tion and dur­ing oper­a­tion can cause dam­age to the pump, ther­mo­stat valves, back­flow inhib­it­or etc. Many heat­ing pumps give out because of mag­net­ic debris (a back­log of cor­ro­sion) in the can.



Can I use a heat­ing pump as a cir­cu­la­tion pump for drink­ing water?

No, the wet mater­i­al of a heat­ing pump doesn’t have KTW (plastics in drink­ing water) approv­al. This is a require­ment for using pumps in drink­ing water.

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