Spa Water Chemistry

Swimming Pool Water Chemistry

Soft Swim Pool Questions

General cleaning and maintenance Questions: Swimming Pools

General cleaning and maintenance Questions: Spas

Common Pool Operating Instructions:


Spa Water Chemistry

How often should I change my spa water?

The more you use the spa, the more often you’ll change the water. Commercial Spas are often changed weekly or twice weekly. Water in Residential Spas is typically changed 3 times a year. The more frequent users may change the water monthly. The less frequent users may change the water just once per year.

You should time your spa water changes to avoid cold weather conditions.

How often should I be cleaning my spa filter cartridges?

Frequency of cleaning depends on the amount of use the spa gets but typically, a spa filter would be cleaned every 6-8 weeks. Try to time it away from the worst weather in the winter. Also, having a spare set of filters works well also.

How often should I be chemically cleaning my spa filter cartridges?

You should use a chemical filter cleaner every time you clean your filters.

What are the appropriate ranges for my chlorine and bromine levels?

Chlorine 2.0 ppm to 6.0 ppm

Bromine 4.0 ppm to 10.0 ppm

How often should I check my pH, chlorine/bromine levels?

This depends on the type of use and the volatility of the chemical balance. When the spa is first filled with fresh water, it may need to be adjusted more often then when it is a month old and the water balance is more stable. Commercial Spas need daily or more frequent testing. Typically Residential Spas are tested daily when first filled but weekly after balancing is achieved.

Why do I have a white colored chalky substance coating the inside of my spa shell?

Too high of a pH causes calcium carbonate scale to fall out of solution. You also need to be checking and adjusting Total Alkalinity also. This material gets cleaned off with a solution of acid. A visit to a store would be appropriate to get specific instructions and consulation.

What is the flaky yellowish-white substance that came out of my “jets” after I drained and refilled?

Bacteria that grows on the inside of the pipes.

Run jets on HI for 3 - 10 minute cycles to dislodge most of the build-up before draining and refilling. There may still be some material that breaks free but it should be minimal. There is a chemical available called Spa Flush that will help so. It’s available at our stores.

Swimming Pool Water Chemistry

What is backwashing?

Running water backwards though the filter which washes out the dirty.

When should I backwash and for how long?

A minimum of weekly is recommended. Technically if the filter pressure increases 5-10 psi above the ‘clean’ pressure, it should be backwashed. This typically happens after vacuuming or during periods of ‘cleaning up the pool.’ If the pressure doesn’t increase in a week, backwash anyway.

What is "Shocking the Pool?"

Temporarily raising the level of oxidizer or sanitizer in the water to kill bacteria that has built up a resistance to a normal level of sanitizer.

How often should I be "Shocking the Pool?"

Typically, the recommendation is weekly. Less frequently used pools take less frequent shocking.

How can I tell if a stain is algae or a metals base stain?

Place a chlorine tablet in a nylon sock for a few seconds on a stain, if it changes the stain, it is algae. Place some Dry Acid in a nylon sock and place it on a stain for a few seconds. If it changes the stain, it is mineral.

Soft Swim Pool Questions

What is pink slime?

A type of bacteria.

Why can’t I hold a shock level?

There is the presence of bacteria in the pool consuming the shock.

How often should I chemically clean my filter?

You should use a chemical filter cleaner every time you clean your filters.

Why is my pool cloudy?

Typically, there is bacteria in the water.

General cleaning and maintenance Questions: Swimming Pools

How often should I brush or vacuum my pool?

Vacuum when it is dirty. Brush the walls weekly is the best answer.

How long should I circulate my pool for during the day and evening?

This is a very difficult question to answer. The correct answer is however long it takes to keep the pool water clear and clean. This is typically 12-16 hours per day.

How does algae begin to grow and how can I prevent it?

You prevent algae by keeping Santizer in the water and shocking regularly. The use of algaecide in the pool will also help.

When should I change my sand (filter)?

Most of the time, there is no requirement for any regular changing of the sand. On Chlorine Pools, changing the sand every 10 years would be fine. On Soft Swim treated Pools, change the sand every 3 years.

Why cant I hold a chlorine level and my pool is crystal clear?

Typically there is some type of demand on the sanitizer that is hidden. Bacteria in the light niche, in the plumbing lines, under the ladder treads.

How do I patch a pool liner?

Tips on Patching a Pool Liner

  1. The small 1 oz Patch Kits are a good tool. They come with a clear material to use as a patch.  However, if possible, some color matching material could be accessed from when the liner was installed or from Pool World.  If you can patch from the back side of the liner, it will look better. Clear patching material, doesn't look very good installed on the front side.
  2. 4 oz cans can be used for patching larger areas.  If you need more glue an the 4 oz can, you'll need to buy 2 cans.
  3. You can buy Vinyl Patching Material by the Square Foot.
  4. Often times you'll find pieces of your original liner with the paperwork from the construction or replacement of the liner.  Look around for it.
  5. Tips on Patching:

Always use a round patch.   

Dry Patches:

Mark where you are going to put the patch and only apply glue to the patch and the area to be patched.

Wet Patches:

Liberally apply glue to the patch, fold it over and quickly move it through the water to the area. Unfold and apply. Hold down tightly until it adheres.

General cleaning and maintenance Questions: Spas

How often should I be cleaning my spa filter cartridges?

Frequency of cleaning depends on the amount of use the spa gets but typically, a spa filter would be cleaned every 6-8 weeks. Try to time it away from the worst weather in the winter. Also, having a spare set of filters works well also.

How do I clean my spa filter?

First, deteremine how your filter comes apart. On older spas, the filter may be in a separate container and valves may need to be turned off. Newer spas, the filter is accessed typically from inside the spa. Turn power off to spa when removing filters as some debris may be sucked into the pump when filter is removed.

A chemical Filter Cleaner is used on the Spa filter. Follow manufacturer’s instructions.

Having a second filter for rotating the use of the Filter Elements significantly extends the life of the Filters.

Common Pool Operating Instructions:

Priming Pump - Normally

  1. Turn off Pump
  2. Close MAIN DRAIN and SKIMMER VALVES
  3. Open Pump Hair & Lint Strainer Basket and Fill with Water, then replace the lid on the Pump Hair & Lint Strainer
  4. At the SAME time you turn on the Pump, Open the SKIMMER VALVE completely. DO NOT OPEN THE MAIN DRAIN VALVE.
  5. If you have a clear lid on the pump, you should Start seeing water come into the front of the pump. If this doesn’t happen within 2 minutes, continue. If the pump primes, stop here.
  6. If the pump doesn’t prime in two minutes, TURN OFF THE PUMP AT THE SAME TIME YOU CLOSE THE SKIMMER VALVE.
  7. Return to Step #3 and repeat until it Primes. If it doesn’t prime in the 3-4 tries, try the Force Priming Method listed above.

Priming Pump by Force

  1. Close MAIN DRAIN VALVE, leave SKIMMER VALVE open.
  2. Take garden hose, with rag wrapped around it and put it in the back port of the skimmer wait until pump is moving water and there is some suction on the garden hose. Hold rag rightly, as the pump may suck the rag through the line when a prime is established.
  3. Open MAIN DRAIN VALVE Slowly.
  4. This can also be done with a submersible Pump and Vacuum Hose put into the Pool Skimmer Suction Line connection

How do I Backwash a Sand Filter?

  1. Turn off pump, heater (if heater has been on let heater cool for TWENTY minutes before turning off pump), and monitor systems.
  2. Close MAIN DRAIN and SKIMMER VALVES.
  3. Clean pump of hair and lint in strainer basket.
  4. Turn FILTER VALVE to BACKWASH.
  5. Open SKIMMER and MAIN DRAIN VALVES.
  6. Start pump – Backwash until water coming out of backwash hose is clear (two to five minutes).
  7. Turn off pump.
  8. Put filter valve in ‘RINSE’ position.
  9. Start pump and run for 30 seconds.
  10. Turn off pump.
  11. Put filter valve in “FILTER” position.
  12. Start pump and turn heater back on.

How do I use Sand Filter Cleaners?

Two of the most common filter cleaners used for sand filters would be the GLB Filter Rinse and the GLB Filter Cleanse.

Filter Rinse

  1. Close the MAIN DRAIN if possible to allow maximum intake from skimmer(s).
  2. Start filter backwash as recommended by manufacturer.
  3. While filter is backwashing SLOWLY pour 8 ounces of FILTER RINSE into skimmer so that it goes directly through filter.
  4. Continue backwash procedure according to manufacturer’s instructions.
  5. Use Filter Rinse once every three weeks to help maintain crystal clear water.

Filter Cleanse

  1. Backwash filters; then shut off pump and remove hair and lint pot cover.
  2. Drain Filter.
  3. Turn on pump, make certain that handle is in backwash position, and slowly pour Filter Cleanse solution into hair and lint pot with pump running.
  4. Do not let pump run dry.
  5. Continue to add Filter Cleanse until sand or elements are covered.
  6. Shut off pump at once, leave in backwash position and allow to stand overnight (12 hours).
  7. Backwash until water coming from backwash line is clear.
  8. Do not allow solution to get into pool.
  9. Start pump and fill filter with clear water.
  10. Use Filter Cleanse every 3-4 months for optimal use of filter.

How do I vacuum my Pool?

  1. If filter is dirty – clean before starting. (See BACKWASHING).
  2. Set-up vacuum equipment and place vacuum head with hose end pole attached in the pool.
  3. Hold end of vacuum hose over pool return fitting until all air is evacuated from vacuum hose or fill the vacuum hose otherwise.
  4. Place hand over vacuum hose while in pool and move to skimmer while holding hand on end of hose.
  5. Now remove skimmer lid and basket. Insert vacuum hose in hole of skimmer; which has pump suction.
  6. Turn – off MAIN DRAIN Valve at pump. Plug OFF skimmer(s) not being used for vacuuming. Now you are vacuuming.
  7. If suction decreases while vacuuming, clean pump basket or clean filter during vacuum procedure.
  8. When FINISHED vacuuming, let system run with vacuum hose hooked up for 2 minutes to clear dirt from hose.
  9. Turn – on MAIN DRAIN VALVE when finished vacuuming.
  10. Remove plug from skimmer and put away vacuum equipment.

How do I Clean my Pump Basket?

  1. Turn off pump, heater (if heater has been on let heater cool for TWENTY minutes before turning off pump), and monitor systems.
  2. Close MAIN DRAIN VALVE, SKIMMER VALVE, and RETURN LINE VALVE.
  3. Turn filter removal knob and remove dirty basket.
  4. Clean basket.
  5. Re-assemble pump.
  6. Open MAIN DRAIN VALVE, SKIMMER VALVE, and RETURN LINE VALVE.
  7. Start pump, heater, and monitor systems.

How do I DRAIN my Swimming Pool?

To Drain SOME water from pool. (Up to 12”)

  1. Turn off pump, heater (Let heater cool for TWENTY minutes if its been on), and monitoring systems.
  2. Rotate MULTIPORT VALVE to WASTE.
  3. Close SKIMMER VALVE.
  4. Turn pump only on and Run until pool is drained down to the proper level (Maximum 12”).
  5. Turn off pump.
  6. Refill pool.
  7. Open SKIMMER VALVE.
  8. Put MULTIPORT VALVE back to FILTER.
  9. Turn back on Pump, Heater, and Monitor Systems.

To Drain Pool Completely

WARNING: Be sure to be present whenever draining pool to avoid floating the pool out of the ground.

If you have ground water present under the pool, it must be removed before draining.

If you have a fiberglass pool, you should walk around on the shallow end of the pool and the transition slope during the draining to make sure that the pool does not feel like you are standing on a “waterbed”.

If you have any doubt about draining the pool, don’t until you seek Professional Assistance.

Generally draining the pool between December and June is more risky than between July and November.

  1. Turn Pump, Heater off (Let heater cool for TWENTY minutes if its been on before turning pump off), and Monitor Systems off.
  2. Use Sump Pump to drain pool. (Sump pump can be rented from Pool World).
  3. Attach waste hose to Sump Pump. Put end of waste hose 100ft away from pool. (Run the water as far from the pool as possible during draining to minimize the potential to float the pool out of the ground from water running back under the pool).
  4. Put Sump Pump in deep of pool. Plug in.
  5. When pool is drained, unplug Sump Pump and remove from pool.
  6. If you are renting pump, you can bring it back.
  7. Leave pump, heater, and monitoring systems off until Pool is full.

General Water Chemistry:

What is pH?

Acid / Alkaline balance of the pool.